A selection program to improve yield of beans (Phaseolus vulgaris L.) when grown in association with maize (Zea mays L.) : the results of the F6 generation [Studentenverslag]
Roumen, E.C. \ Schellekens, J.J.A.M. \ 1986
Basis op de helling : vanuit de themagroep regionale ontwikkeling : een verslag van een samenwerking van agrarische jongeren uit Mergelland-Oost met drie studenten (de projektgroep0 [Studentenverslag]
Heykers, H. \ Joosten, R. \ Roumen, J. \ 1984
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