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Effects of fallow type and farmer's practices on weed infestation in an upland rice based swidden system in northern Thailand. Van Keer Koen, Vejpas Chirawat, Trébuil Guy. 1995. In : Weed science conference. University of Peradenyia. Sri Lanka : University of Peradenyia, 8 p. Weed Science Conference. 2, Sri Lanka, 26 Mai 1995/27 Mai 1995.