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Bohren, Christian, Bertossa, Mario, Schönenberger, Nicola, Rossinelli, Marta, Conedera, Marco , 2011. Environmental weeds and invasive plants. 3rd international symposium of environmental weeds and invasive plants : Monte Verità, Ascona, Switzerland, October 2-7, 2011. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, [S.l.]. 149 pp.