1. E.B. Babcock, The genus Crepis: I. The taxonomy, phylogeny, distribution, and evolution of Crepis, Univ. Calif. Press, Berkeley, 1947, 197 pp.
2. M. Navashin, On some chromosome alterations induced by X-rays in Crepis, Proc. Fifth Int. Bot. Congr. Cambridge., 1931a, pp. 241–242.
3. A preliminary report on some chromosome alterations by X-rays in Crepis;Navashin;Am. Nat.,1931
4. Biological investigations of higher and lower plants abroad, Soyuz 19;Dubinin;Life Sci. Space Res.,1977
5. Radiobiological experiments with plant seeds aboard the biosatellite KOSMOS 1887;Anikeeva;Nucl. Tracks Radiat. Meas.,1990