info:oai:orgprints.org:7373info:ofi/fmt:xml:xsd:bookGrootS.P.C.Groot, S.P.C.JalinkH.Jalink, H.Hospers-BrandsM.Hospers-Brands, M.KöhlJ.Köhl, J.VeermanA.Veerman, A.WennekerM.Wenneker, M.van der WolfJ.M.van der Wolf, J.M.van den BulkR.Wvan den Bulk, R.W2006Improvement of the quality of propagation material for organic farming systemproceeding