Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="Koen, H." or (type any "bookEditor issueEditor" and editor="Koen, H.") Add to list PhD Thesis open access Bydrae tot die studie van die wedersydse beïnvloeding van knopwortelaalwurms (Meloidogyne spp.) en sekere gasheerplante / H. Koen. H. Koen (1964)