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Arlettaz, Raphaël; Patthey, Patrick; Baltic, Marjana; Leu, Thomas; Schaub, Michael; Palme, Rupert; Jenni-Eiermann, Susanne (2007). Spreading free-riding snow sports represent a novel serious threat for wildlife. Proceedings of the Royal Society. Series B - biological sciences, 274(1614), pp. 1219-1224. London: Royal Society of London 10.1098/rspb.2006.0434
