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- Schischkin, B.K. & Bobrov, E.G. (eds.) 1961. Flora URSS (Flora Unionis Rerumpublicarum Sovieticarum Socialisticarum) XXVI. [Compositae, Tribes Anthemideae, Senecioneae and Calenduleae] [in Russian]. 938 pp. Academia Scientiarum URSS, Mosqua, Leningrad. DJVU English translation: 862 pp. BHL
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