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Nentwig, Wolfgang; Josefsson, Melanie (2010). Introduction, Chapter 1. BioRisk, 4(1), pp. 5-9. Sofia: Pensoft Publishers 10.3897/biorisk.4.43
Vila, Montserrat; Basnou, Corina; Pysek, Petr; Josefsson, Melanie; Genovesi, Piero; Gollasch, Stephan; Nentwig, Wolfgang; Olenin, Sergej; Roques, Alain; Roy, David; Hulme, Philip E. (2009). How well do we understand the impacts of alien species on ecosystem services? A pan-European, cross-taxa assessment. Frontiers in ecology and the environment, 8(3), pp. 135-144. Washington, D.C.: Ecological Society of America 10.1890/080083
