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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.
Lacadena, J. R. & E. Ferrer. 1978. Homologous somatic association in Crepis species: A critical comparison of several statistical approaches. Chromosoma 67: 77–86.