| Crepis biennis L. | Ikeda, H. 1988. Karyomorphological studies on the genus Crepis with special reference to C-banding pattern. J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 22: 65–117. | 88-89 | | 40 |
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| Crepis biennis L. | Van Loon, J. C. & A. K. V. Setten. 1982. IN: IOPB Plant chromosome number reports. Taxon 31: 589–592. | 82-83 | | 36-40 |
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| Crepis biennis L. | Starlinger, F., E. Vitek, K. Pascher & M. Kiehn. 1994. Neue Chromosomenzählungen für die Flora Rumäniens. Pp. 181–194. In Naturwissenschaftliche Forschungen uber Siebenburgen V: Beitrage zur Flora, Vegetation und Fauna von Siebenburgen. Bohlau Verlag, Koln. | 94-95 | | 40 |
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| Crepis biennis L. | Albers, F. & W. Pröbsting. 1998. In R. Wisskirchen & H. Haeupler, Standardliste der Farn- und Blütenpflanzen Deutschlands. Bundesamt für Naturschutz & Verlag Eugen Ulmer, Stuttgart. | 98-00 | | 40 |
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| Crepis biennis L. | Lövkvist, B. & U. M. Hultgård. 1999. Chromosome numbers in south Swedish vascular plants. Opera Bot. 137: 1–42. | 98-00 | | 40 |
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| Crepis biennis L. | 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. | 98-00 | | c.40+0-3B |
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| Crepis biennis L. | Siljak-yakovlev, S. & a. Cartier. 1979. Utilisation de la coloration differentielle au Giemsa dans l'analyse des caryotypes de quatre Crepis. Rev. Cytol. Biol. Vég., Bot. 2: 13–20. | 79-81 | | 40+0-1 |
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| Crepis biennis L. | Dvorak, F., F. Grull, R. Kurka, I. Ruzicka & B. Dadakova. 1980. In Chromosome number reports LXVIII. Taxon 29: 544. | 79-81 | | 36-40 |
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| Crepis biennis L. | Kuzmanov, B., S. Georgieva, V. Nikolova & I. Penceva. 1981. In Chromosome number reports LXXII. Taxon 30: 701–702. | 79-81 | | 40 |
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| Crepis biennis L. | Morton, J. K. 1977. A cytological study of the Compositae (excluding Hieracium and Taraxacum) of the British Isles. Watsonia 11: 211–223. | 75-78 | | 40 |
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| Crepis biennis L. | Murin, A. 1978. In Index of chromosome numbers of Slovakian flora. Part 6. Acta Fac. Rerum Nat. Univ. Comenianae, Bot. 26: 1–42. | 75-78 | | 40 |
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