Programma voor oecologisch onderzoek / P.J.M. van der Aart, J. van Andel, J.W. WoldendorpThe integrated study of bird populations : proceedings of a symposium, held in Wageningen, The Netherlands, 17-21 September 1979 / Koninklijke Nederlandse Akademie van Wetenschapen ; ed: H. Klomp and J.W. WoldendorpCompetition for ammonium between plant roots and nitrifying and heterotrophic bacteria and the effects of protozoan grazing / F.J.M. Verhagen, H.J. Laanbroek and J.W. WoldendorpActivity of chemolithotrophic nitrifying bacteria under stress in natural soils / H.J. Laanbroek and J.W. WoldendorpStructure and functioning of plant populations / editors, A.H.J. Freysen and J.W. WoldendorpThe integrated study of bird populations : proceedings of a symposium held in Wageningen on 17-21 September 1979 / ed. H. Klomp, J.W. WoldendorpStructure and functioning of plant populations