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Thomas More Kempen University College, Geel Belgium
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Gent University, Belgium
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Sofia University "St. Kliment Ohridski"
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Curie Institute, Orsay, France
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The French National Institute for Agricultural Research (Agronomic Station), Clermont-Ferrand, France
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National Agronomic School of Rennes, France
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Schmidt Seeger AG, Germany
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University of Hohenheim, Sttutgart, Germany
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University of Wageningen, Olanda
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Technological Educational Institute of Thessaloniki, Greece
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University of Florence, Italy
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University of Pisa, Italy
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Faculty of Agricultural Science and Food, Skopje, Macedonia
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University of Evora, Portugal
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University of Novi-Sad, Serbia
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Faculty of Agriculture - University of Banja Luka, Serbia
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University of Tras-os-Montes and Alto Duro, Spain
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Purdue University, United States of America
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University of Szeged, Hungary
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University of Agriculture, Göddöllö, Hungary