Literature
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- Zahn K. H. 1922–30: Hieracium. — In: †Ascherson P., Graebner P. [fortgesetzt von: Graebner P., Graebner P. fil.]: Synopsis der mitteleuropäischen Flora 12(1): 592 pp. + 93 pp. [Register] [1–80 (1922), 81–160 (1924), 161–224 (1929), 225–592 + 93 pp. (1930)].
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