E. D.  Regel and Epstein, S. M., ?External Morphology of the Larvae of Onychodactylus fischeri Boul., Hynobiidae?, Zoologichesky Zhurnal, vol. 56, pp. 901-912, 1977.

E. M.  Smirina, Serbinova, I. A., and Makarov, A. N., ?Some complicated cases of age determination using the annual layers of bones in amphibians (with the example of the long-tailed salamander, Onychodactylus fischeri (Amphibia, Hynobiidae)?, Zoologichesky Zhurnal, vol. 73, pp. 72-81, 1994.