Items where Author is "Wolfert, Sjaak"
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Wolfert, Sjaak Sustainable agriculture: how to make it work? : a modeling approach to support management of a mixed ecological farm. [S.l. : s.n.]. ISBN 9058086720 , 2002
Wolfert, Sjaak and Stomph, Tjeerd Jan van der and Werf, Wopke Ecologiseren : terug naar huis? , 1998.