Literature
- Fischer von Waldheim, G. 1812-1813. Recherches zoologiques. Mém. Soc. Nat., Moscou, 4: 239-275, pl. 9 (repr. 1830).
- Pallas, P. S. 1811. [probably 1814]. Zoographia rosso-asiatica, sistens omnium animalium in extenso Imperio Rossico et adjacentibus maribus observatorum recensionem, domicilia, mores et descriptiones anatomen atque icones plurimorum, 3 vol. Petropoli, 3, 428 pp. (pl. [1], XIII, XIV, XV, XXI, XX (sic)) (89 pl. are mentioned in the text but are unpublished. Perhaps published in Icones ad Zoographiam Rosso-Asiaticam, 1834-427.). (2nd ed., 1831, 3 vol. and Atlas, Petropoli.).