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Raudnitschka, Dorit and Hensen, Isabell and Oberprieler, Christoph (2007) Introgressive Hybridization of Senecio hercynicus and S. ovatus (Compositae, Senecioneae) along an altitudinal gradient in Harz National Park (Saxony-Anhalt, Germany). Systematics and Biodiversity 5 (3), pp. 333-344.
Hensen, Isabell and Oberprieler, Christoph (2005) Effects of population size on genetic diversity and seed production in the rare Dictamnus albus(Rutaceae) in central Germany. Conservation Genetics 6 (1), pp. 63-73.