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Melander, Bo; Rasmussen, Ilse A. and Hansen, Preben Klarskov (2011) Nye danske resultater med bekæmpelse af Kveke (Elytrigia repens), Hestehov (Tussilago farfara) og Åkertistel (Cirsium arvense) i økologisk jordbrug. Speech at: National seminar, “Flerårige ugras i eng og åker”, Sarpsborg, d. 8 feb. 2011, Sarpsborg, Norge.