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Dimitrova, D. & J. Greilhuber. 2000. Karyotype and DNA-content evolution in ten species of Crepis (Asteraceae) distributed in Bulgaria. Bot. J. Linn. Soc. 132: 281–297.
Dimitrova, D. & J. Greilhuber. 2001. C-Banding patterns and quantitative karyotype characteristics of Bulgarian species of Crepis (Asteraceae). Pl. Biol. (Stuttgart) 3: 88–97.
Dimitrova D, Greilhuber J. 2000. Karyotype and DNA-content evolution in ten species of Crepis (Asteraceae) distributed in Bulgaria. Botanical Journal of the Linnean Society 132: 281-297.