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Researcher
Ivona Sigurnjak
Profile
Projects
Publications
Activities
Awards & Distinctions
88
Results
2024
Digestate in replacement of synthetic fertilisers : a comparative 3-year field study of the crop performance and soil residual nitrates in West-Flanders
Gregory Reuland
Tomas Van de Sande
Harmen Dekker
Ivona Sigurnjak
Erik Meers
A1
Journal Article
in
EUROPEAN JOURNAL OF AGRONOMY
2024
Enhancing swine manure treatment : a full-scale techno-economic assessment of nitrogen recovery, pure oxygen aeration and effluent polishing
Ruben Vingerhoets
Ivona Sigurnjak
Marc Spiller
Siegfried Vlaeminck
Erik Meers
A1
Journal Article
in
JOURNAL OF ENVIRONMENTAL MANAGEMENT
2024
Evaluation of performance and efficiency of bio-based and tailor-made fertilisers in selected nutrient vulnerable regions of the EU
Vaibhav Shrivastava
Erik Meers
Ivona Sigurnjak
Laura Diaz-Guerra
Dissertation
2024
Logistics tool : the economic potential of nutrient recovery from manure in the European Union Member States
Ruben Vingerhoets
Marc Spiller
Ivona Sigurnjak
Oscar Schoumans
Siegfried E. Vlaeminck
Erik Meers
C3
Conference
2024
Manure valorisation for the production of ammonium nitrate and ammonium sulphate in a Flemish farm (the Belgian pilot of FERTIMANURE)
Ruben Vingerhoets
Ivona Sigurnjak
Erik Meers
C3
Conference
2024
Post-treatment of high-rate activated sludge effluent via zeolite adsorption and recovery of ammonium-nitrogen as alternative fertilising products
Sarah Moreno Sayavedra
Lennert Dockx
Ivona Sigurnjak
Çağrı Akyol
Erik Meers
A1
Journal Article
in
BIORESOURCE TECHNOLOGY
2024
The use of digestate as a biobased fertiliser : nitrogen fertilising properties and interactions with soil organic carbon
Gregory Reuland
Erik Meers
Ivona Sigurnjak
Dissertation
2024
2023
Ammonia stripping and scrubbing followed by nitrification and denitrification saves costs for manure treatment based on a calibrated model approach
Ruben Vingerhoets
Claudio Brienza
Ivona Sigurnjak
Jeroen Buysse
Siegfried E. Vlaeminck
Marc Spiller
Erik Meers
A1
Journal Article
in
CHEMICAL ENGINEERING JOURNAL
2023
Ammonia stripping-scrubbing followed by nitrification-denitrification saves costs for manure treatment : a calibrated model approach
Ruben Vingerhoets
Claudio Brienza
Ivona Sigurnjak
Siegfried E. Vlaeminck
Marc Spiller
Erik Meers
C3
Conference
2023
Ammonia water as a biobased fertiliser : evaluating agronomic and environmental performance for Lactuca sativa compared to synthetic fertilisers
Vaibhav Shrivastava
Ivona Sigurnjak
Nimisha Edayilam
Erik Meers
A2
Journal Article
in
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
2023
Dynamics of soil nitrogen and N-cycling-related genes following the application of biobased fertilizers
Hongzhen Luo
Massimo Zilio
Ivona Sigurnjak
Ana Robles Aguilar
Evi Michels
Fabrizio Adani
Stefaan De Neve
Erik Meers
A1
Journal Article
in
APPLIED SOIL ECOLOGY
2023
Evaluation of a new approach for swine wastewater valorisation and treatment : a combined system of ammonium recovery and aerated constructed wetland
Claudio Brienza
Natalia Carolina Donoso Pantoja
Hongzhen Luo
Ruben Vingerhoets
Denis de Wilde
Dion van Oirschot
Ivona Sigurnjak
Jayanta Kumar Biswas
Evi Michels
Erik Meers
A1
Journal Article
in
ECOLOGICAL ENGINEERING
2023
Quantifying CO2 emissions and carbon sequestration from digestate-amended soil using natural 13C abundance as a tracer
Gregory Reuland
Steven Sleutel
Haichao Li
Harmen Dekker
Ivona Sigurnjak
Erik Meers
A1
Journal Article
in
AGRONOMY-BASEL
2023
2022
Assessment of the carbon and nitrogen mineralisation of digestates elaborated from distinct feedstock profiles
Gregory Reuland
Ivona Sigurnjak
Harmen Dekker
Steven Sleutel
Erik Meers
A1
Journal Article
in
AGRONOMY-BASEL
2022
Assessment of the nitrogen fertilising value and carbon sequestration potential of digestates from different feedstocks
Gregory Reuland
Ivona Sigurnjak
H. Dekker
Steven Sleutel
Erik Meers
C3
Conference
2022
Benefits of biobased fertilizers as substitutes for synthetic nitrogen fertilizers : field assessment combining minirhizotron and UAV-based spectrum sensing technologies
Hongzhen Luo
Kevin Dewitte
Sofie Landschoot
Ivona Sigurnjak
Ana Robles Aguilar
Evi Michels
Stefaan De Neve
Geert Haesaert
Erik Meers
A1
Journal Article
in
FRONTIERS IN ENVIRONMENTAL SCIENCE
2022
Digestate-derived ammonium fertilizers and their blends as substitutes to synthetic nitrogen fertilizers
Amrita Saju
Demi Ryan
Ivona Sigurnjak
Kieran Germaine
David N. Dowling
Erik Meers
A1
Journal Article
in
APPLIED SCIENCES-BASEL
2022
Dynamics of nitrogen uptake and dry matter accumulation during maize (Zea mays L.) growth
Mihaela Šatvar
Željko Jukić
Marko Petek
Tomislav Karažija
Sanja Slunjski
Ivona Sigurnjak
Erik Meers
Lepomir Čoga
C3
Conference
2022
Effect of recycling-derived fertilisers and tailor-made blends as a synthetic N fertiliser substitute tested under controlled laboratory conditions
Amrita Saju
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2022
Greenhouse gas emissions from a sandy loam soil amended with digestate-derived biobased fertilisers : a microcosm study
Caleb Elijah Egene
Inge Regelink
Ivona Sigurnjak
Fabrizio Adani
Filip Tack
Erik Meers
A1
Journal Article
in
APPLIED SOIL ECOLOGY
2022
Laboratory and field assessment on the nitrogen value of manure-derived biobased fertilizers
Hongzhen Luo
Ivona Sigurnjak
Ana Robles Aguilar
Evi Michels
Stefaan De Neve
Erik Meers
C3
Conference
2022
Performance of a full-scale processing cascade that separates agricultural digestate and its nutrients for agronomic reuse
Jasper L. van Puffelen
Claudio Brienza
Inge C. Regelink
Ivona Sigurnjak
Fabrizio Adani
Erik Meers
Oscar F. Schoumans
A1
Journal Article
in
SEPARATION AND PURIFICATION TECHNOLOGY
2022
Replacing mineral fertilisers for bio-based fertilisers in potato growing on sandy soil : a case study
Chantal M. J. Hendriks
Vaibhav Shrivastava
Ivona Sigurnjak
Jan Peter Lesschen
Erik Meers
Rembert van Noort
Zhongchen Yang
Rene P. J. J. Rietra
A1
Journal Article
in
APPLIED SCIENCES-BASEL
2022
What are the desired properties of recycling-derived fertilisers from an end-user perspective?
A. Egan
Amrita Saju
Ivona Sigurnjak
Erik Meers
N. Power
A2
Journal Article
in
CLEANER AND RESPONSIBLE CONSUMPTION
2022
2021
Agronomic and environmental performance of Lemna minor cultivated on agricultural wastewater streams : a practical approach
Reindert Devlamynck
Marcella Fernandes De Souza
Evi Michels
Ivona Sigurnjak
Natalia Carolina Donoso Pantoja
Carl Coudron
Jan Leenknegt
Pieter Vermeir
Mia Eeckhout
Erik Meers
A1
Journal Article
in
SUSTAINABILITY
2021
Assessing nitrogen availability in biobased fertilizers : effect of vegetation on mineralization patterns
Hongzhen Luo
Ana Robles Aguilar
Ivona Sigurnjak
Evi Michels
Erik Meers
A1
Journal Article
in
AGRICULTURE-BASEL
2021
Assessing nitrogen availability in biobased fertilizers : effect of vegetation on mineralization patterns
Hongzhen Luo
Ana Robles Aguilar
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2021
Impact of time and phosphorus application rate on phosphorus bioavailability and efficiency of secondary fertilizers recovered from municipal wastewater
Aleksandra Bogdan
Ciaran O' Donnell
Ana Robles Aguilar
Ivona Sigurnjak
Niamh Power
Evi Michels
Joe Harrington
Erik Meers
A1
Journal Article
in
CHEMOSPHERE
2021
Product composition and performance in lab- and field trials for biobased fertilisers and soil improvers recovered from digestate : a report from the H2020 project SYSTEMIC
Ivona Sigurnjak
Claudio Brienza
Inge C. Regelink
Caleb Elijah Egene
Gregory Reuland
Hongzhen Luo
Mihalea Šatvar
Massimo Zilio
Erik Meers
Report
2021
Production of a mineral nitrogen biobased fertiliser from digestate through full-scale membrane filtration
Claudio Brienza
Jasper van Puffelen
Inge Regelink
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Erik Meers
C3
Conference
2021
Solid fraction of separated digestate as soil improver : implications for soil fertility and carbon sequestration
Caleb Elijah Egene
Ivona Sigurnjak
Inge C. Regelink
Oscar F. Schoumans
Fabrizio Adani
Evi Michels
Steven Sleutel
Filip Tack
Erik Meers
A1
Journal Article
in
JOURNAL OF SOILS AND SEDIMENTS
2021
Techno-economic assessment at full scale of a biogas refinery plant receiving nitrogen rich feedstock and producing renewable energy and biobased fertilisers
Claudio Brienza
Ivona Sigurnjak
T. Meier
Evi Michels
F. Adani
O. Schoumans
C. Vaneeckhaute
Erik Meers
A1
Journal Article
in
JOURNAL OF CLEANER PRODUCTION
2021
The nitrogen value of biobased products from an integrated anaerobic digestion–centrifugation–evaporation process : from laboratory estimation to field evaluation
Hongzhen Luo
Ivona Sigurnjak
Ana Robles Aguilar
Evi Michels
Erik Meers
C3
Conference
2021
The potential of digestate and the liquid fraction of digestate as chemical fertiliser substitutes under the RENURE criteria
Gregory Reuland
Ivona Sigurnjak
Harmen Dekker
Evi Michels
Erik Meers
A1
Journal Article
in
AGRONOMY-BASEL
2021
2020
Ammonia stripping and scrubbing for mineral nitrogen recovery
Claudio Brienza
Ivona Sigurnjak
Evi Michels
Erik Meers
Bookchapter
in
Biorefinery of inorganics : recovering mineral nutrients from biomass and organic waste
2020
Effect of digestate fertilization on the silage maize yield and the load of heavy metals in maize
Mihaela Šatvar
Željko Jukić
Ivana Puljan
Zvonimir Stipić
Sanja Slunjski
Ivona Sigurnjak
Erik Meers
Lepomir Čoga
C3
Conference
2020
Liquid fraction of digestate and air scrubber water as sources for mineral N
Ivona Sigurnjak
Evi Michels
Erik Meers
Bookchapter
in
Biorefinery of inorganics : recovering mineral nutrients from biomass and organic waste
2020
Manure as a resource for energy and nutrients
Ivona Sigurnjak
Reinhart Van Poucke
Céline Vaneeckhaute
Evi Michels
Erik Meers
Bookchapter
in
Biorefinery of inorganics : recovering mineral nutrients from biomass and organic waste
2020
2019
Anaerobic digestion and nutrient recovery : a key linkage towards a closed recycling loop
Gregory Reuland
Erik Meers
Ivona Sigurnjak
Evi Michels
C3
Conference
2019
Assessment of recycling-derived fertilizers and tailor-made blends in laboratory and field
Amrita Saju
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2019
Assessment of tailor made blends of recycling derived fertilizers in pot cultivation of Spinacea oleracea
Amrita Saju
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2019
Assessment of tailor-made fertilizer blends produced from recycled nutrients
Amrita Saju
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2019
Effect of phosphorus fertilizers recovered from municipal wastewater on ryegrass dry matter yield
Aleksandra Bogdan
Evi Michels
Ivona Sigurnjak
Erik Meers
C3
Conference
2019
Evaluation of short term N-effects of recycling derived fertilizers (RDFs) focusing on crop yield and N losses
Tomas Van de Sande
Tim Bockstael
Ines Verleden
Anke De Dobbalaere
Dominique Huits
Amrita Saju
Ivona Sigurnjak
Erik Meers
C3
Conference
2019
Fertilizer performance of organic fertilizers as compared to synthetic fertilizer : a laboratory and a field scale assessment in Croatia
Mihaela Šatvar
Željko Jukić
Marko Petek
Tomislav Karažija
Ivona Sigurnjak
Lepomir Čoga
Erik Meers
C3
Conference
2019
Full scale production of mineral concentrate and ammonium sulphate as nitrogen biobased fertilizers : mass and energy balances
Claudio Brienza
Ivona Sigurnjak
Evi Michels
O Schoumans
Arjan Prinsen
Ute Baurmeister
Thomas Meier
Erik Meers
C3
Conference
2019
Manure in the European Circular Economy : turning a hindrance into an opportunity
Gregory Reuland
S. Pflüger
M. Giacomazzi
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2019
Meta-analysis on the agronomic efficiency and environmental impact of biobased N fertilizers derived from agro-waste
Hongzhen Luo
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2019
Meta-analysis on the potential to substitute mineral fertilizers by biobased fertilizers derived from agro-residues
Hongzhen Luo
Ivona Sigurnjak
Marcella Fernandes De Souza
Evi Michels
Erik Meers
C3
Conference
2019
Nitrogen recovery from biowaste by means of ammonia (stripping-)scrubbing technology at full scale installations
Claudio Brienza
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Fabrizio Adani
Gilberto Garuti
Erik Meers
C3
Conference
2019
Nitrogen recovery from biowaste by means of ammonia stripping technology at full scale installations
Claudio Brienza
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Fabrizio Adani
Ute Bauermeister
Giovanni Boschin
Erik Meers
C3
Conference
2019
Phosphorus availability of fertilizers recovered from municipal wastewater
Aleksandra Bogdan
Evi Michels
Ivona Sigurnjak
Erik Meers
C3
Conference
2019
Production and performance of bio-based mineral fertilizers from agricultural waste using ammonia (stripping-)scrubbing technology
Ivona Sigurnjak
Claudio Brienza
E Snauwaert
A De Dobbelaere
J De Mey
C Vaneeckhaute
Evi Michels
O Schoumans
F Adani
Erik Meers
A1
Journal Article
in
WASTE MANAGEMENT
2019
Solid fraction of digestate for agriculture : assessment of carbon and nitrogen mineralization potential in soil
Caleb Elijah Egene
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Inge Regelink
Erik Meers
C3
Conference
2019
Techno-economic assessment of nitrogen recovery from digestate for the production of mineral biobased fertilizer at full-scale
Claudio Brienza
Ivona Sigurnjak
Evi Michels
OF Schoumans
Ute Bauermeister
Erik Meers
C3
Conference
2019
The fate of nitrite and nitrate during anaerobic digestion
K Ghyselbrecht
A Monballiu
MH Somers
Ivona Sigurnjak
Erik Meers
L Appels
B Meesschaert
A1
Journal Article
in
ENVIRONMENTAL TECHNOLOGY
2019
Variation in carbon and nitrogen mineralization potential of solid fractions of digestate obtained using different separation techniques
Caleb Elijah Egene
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Inge Regelink
Erik Meers
C3
Conference
2019
2018
Carbon and nitrogen mineralization potential of solid fraction of digestate used as soil improvers
Caleb Elijah Egene
Ivona Sigurnjak
Inge Regelink
Oscar Schoumans
Evi Michels
Erik Meers
C3
Conference
2018
Effect of digestate disintegration on anaerobic digestion of organic waste
Matthijs H Somers
Samet Azman
Ivona Sigurnjak
Karel Ghyselbrecht
Erik Meers
Boudewijn Meesschaert
Lise Appels
A1
Journal Article
in
BIORESOURCE TECHNOLOGY
2018
Phos4You : quality assessment of phosphorus fertilizers recycled from municipal wastewater
Aleksandra Bogdan
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2018
Phos4You project : phosphorus availability of phosphorus fertilizers recovered from municipal wastewater
Aleksandra Bogdan
Ciaran O'Donnell
Marina Le Guédard
Evi Michels
Ivona Sigurnjak
Erik Meers
C3
Conference
2018
Phos4You project : phosphorus fertilizers recovered from municipal wastewater and their quality assessment
Aleksandra Bogdan
Ivona Sigurnjak
Evi Michels
Erik Meers
C3
Conference
2018
Role of biowaste processing in nutrient (re)cycling and the circular economy
Erik Meers
Ivona Sigurnjak
Kamila Mascart
Angela Arnau
Marcella Fernandes De Souza
Evi Michels
C3
Conference
2018
SYSTEMIC : nutrient recovery from anaerobic digestate of biowaste : technical assessment of full scale installations throughout Europe
Claudio Brienza
Ivona Sigurnjak
Evi Michels
Uta Bauermeister
Erik Meers
C3
Conference
2018
Stripping and scrubbing of ammonium using common fractionating columns to prove ammonium inhibition during anaerobic digestion
K Ghyselbrecht
A Monballiu
MH Somers
Ivona Sigurnjak
Erik Meers
L Appels
B Meesschaert
A2
Journal Article
in
INTERNATIONAL JOURNAL OF ENERGY AND ENVIRONMENTAL ENGINEERING
2018
2017
Animal manure derivatives as alternatives for synthetic nitrogen fertilizers
Ivona Sigurnjak
Erik Meers
Stefaan De Neve
Filip Tack
Dissertation
2017
Does acidification increase the nitrogen fertilizer replacement value of bio-based fertilizers?
Ivona Sigurnjak
Evi Michels
Sara Crappé
Saskia Buysens
Jayanta K Biswas
Filip Tack
Stefaan De Neve
Erik Meers
A1
Journal Article
in
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
2017
Fertilizer performance of liquid fraction of digestate as synthetic nitrogen substitute in silage maize cultivation for three consecutive years
Ivona Sigurnjak
Céline Vaneeckhaute
Evi Michels
Bart Ryckaert
Greet Ghekiere
Filip Tack
Erik Meers
A1
Journal Article
in
SCIENCE OF THE TOTAL ENVIRONMENT
2017
Liquid fraction of digestate as good as chemical fertiliser? : observations from a three-year field experiment
Ivona Sigurnjak
Céline Vaneeckhaute
Evi Michels
Bart Ryckaert
Greet Ghekiere
Filip Tack
Erik Meers
A4
Journal Article
in
COMMUNICATIONS IN AGRICULTURAL AND APPLIED BIOLOGICAL SCIENCES
2017
Nitrogen release and mineralization potential of derivatives from nutrient recovery processes as substitutes for fossil fuel-based nitrogen fertilizers
Ivona Sigurnjak
Jeroen De Waele
Evi Michels
Filip Tack
Erik Meers
Stefaan De Neve
A1
Journal Article
in
SOIL USE AND MANAGEMENT
2017
Systemic : production of biobased fertilizers from digestate : an in depth analysis of 5 full scale installations throughout Europe
Claudio Brienza
Ivona Sigurnjak
Evi Michels
Oscar Schoumans
Arjan Prinsen
Erik Meers
C3
Conference
2017
The fate of heavy metals in anaerobic digestion process
Ivona Sigurnjak
Evi Michels
Filip Tack
Erik Meers
C3
Conference
2017
2016
Utilization of derivatives from nutrient recovery processes as alternatives for fossil-based mineral fertilizers in commercial greenhouse production of Lactuca sativa L.
Ivona Sigurnjak
Evi Michels
Sara Crappé
Saskia Buysens
Filip Tack
Erik Meers
A1
Journal Article
in
SCIENTIA HORTICULTURAE
2016
2015
Bemestingswaarde van spuiwater en dunne fractie van digestaat in bloemkool
Tomas Van De Sande
Bart Ryckaert
Anke De Dobbelaere
Brecht Annicaert
Erik Meers
Ivona Sigurnjak
Newsarticle
2015
Heavy metal concentration in manure and digestate: a simulation model
Ivona Sigurnjak
Evi Michels
Filip Tack
Erik Meers
C3
Conference
2015
Nitrogen mineralization potential of bio-based fertilizers
Ivona Sigurnjak
Evi Michels
Stefaan De Neve
Erik Meers
C3
Conference
2015
Nitrogen use efficiency of liquid fraction of digestate: a three-year field experiment (Zea Mays L.)
Ivona Sigurnjak
Céline Vaneeckhaute
Evi Michels
Bart Ryckaert
Greet Ghekiere
Filip Tack
Erik Meers
C3
Conference
2015
Nutrient recovery from digestate: case study report
Viooltje Lebuf
Emilie Snauwaert
Evi Michels
Erik Meers
Ivona Sigurnjak
Lies De Clercq
Anke De Dobbelaere
Bart Ryckaert
Report
2015
Veldproeven met biogebaseerde meststoffen
Lies De Clercq
Evi Michels
Erik Meers
Ivona Sigurnjak
Céline Vaneeckhaute
Brecht Annicaert
Mathias Cougnon
Dirk Reheul
Thijs Vanden Nest
Lies Willaert
et al.
Report
2015
2014
Bio-based fertilizers for greenhouse cropping: a lab and field scale assessment
Ivona Sigurnjak
Evi Michels
Sara Crappé
Ellen Dolmans
Filip Tack
Erik Meers
C3
Conference
2014
Nutrient use efficiency of liquid fraction of digestate: a three-year field trial
Ivona Sigurnjak
Céline Vaneeckhaute
Evi Michels
Bart Ryckaert
Johan Vandenbulcke
Greet Ghekiere
Filip Tack
Erik Meers
C3
Conference
2014
Spuiwater in de praktijk
Céline Schollier
Evi Michels
Hilde De Wachter
Bart Ryckaert
Ivona Sigurnjak
Erik Meers
A4
Journal Article
in
VARKENSBEDRIJF
2014
2013
Bio-based fertilizer for the greenhouse cropping: a lab and field scale assessment
Ivona Sigurnjak
Evi Michels
Sara Crappé
Ellen Dolmans
Filip Tack
Nico Vergote
Erik Meers
C3
Conference
2013
Field and lab scale assessment of bio-based mineral fertilizer substitutes
Ivona Sigurnjak
Evi Michels
Greet Ghekiere
Bart Ryckaert
Viooltje Lebuf
Filip Tack
Erik Meers
C3
Conference
2013
Field and lab scale assessment of bio-based mineral fertilizer substitutes
Ivona Sigurnjak
Céline Vaneeckhaute
Evi Michels
Greet Ghekiere
Viooltje Lebuf
Frederik Accoe
Filip Tack
Erik Meers
C3
Conference
2013
Nutrient and energy recuperation from digestate
Ivona Sigurnjak
Céline Vaneeckhaute
Erik Meers
Evi Michels
Greet Ghekiere
Frederik Accoe
Viooltje Lebuf
Filip Tack
C3
Conference
2013
Optimization of nutrient fluxes in European agriculture by using bio-based mineral fertilizer substitutes: a field experiment
Ivona Sigurnjak
Ellen Dolmans
Evi Michels
Bart Ryckaert
Viooltje Lebuf
Filip Tack
Erik Meers
C3
Conference
2013
Spuiwater van luchtwasser als groene minerale meststof
Erik Meers
Evi Michels
Hilde De Wachter
Sara Crappé
Céline Schollier
Bart Ryckaert
Ivona Sigurnjak
A4
Journal Article
in
VARKENSBEDRIJF
2013