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Dupre C, Stevens CJ, Ranke T, Bleeker A, Peppler-Lisbach, C, Gowing DJ, Dise NB, Dorland E, Bobbink R, Diekmann M. Changes in species richness and composition in European acidic grasslands over the past 70 years: the contribution of cumulative atmospheric nitrogen deposition. . Global Change Biology. 2009  ;161(1):344-357.