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Beer, Ruth; Kaiser, Franziska; Schmidt, Kaspar; Ammann, Brigitta; Carraro, Gabriele; Grisa, Ennio; Tinner, Willy (2008). Vegetation history of the walnut forests in Kyrgyzstan (Central Asia): natural or anthropogenic origin? Quaternary Science Reviews, 27(5-6), pp. 621-632. Oxford: Pergamon 10.1016/j.quascirev.2007.11.012
