1. Fankhauser, G., and R. R. Humphrey: Induction of triploidy and haploidy in axolotl eggs by cold treatment. Biol. Bull. 83, 367?374 (1942).
2. Humphrey, R. R., and G. Fankhauser: The ovaries in triploid axolotl females of different genotypes with respect to sex chromosomes. Anat. Rec. 94, 472 (1946) (Abstract).
3. Kawamura, T.: Reproductive ability of triploid newts, with remarks on their offspring. J. Sci. Hiroshima Univ., Ser. B. Div. 1, 12, 1?10 (1951).
4. Pennock, L. A.: Triploid in parthenogenetic species of the teiid lizard genus Cnemidophorus. Science 149, 539?540 (1965).
5. Saez, F. A., and N. Brum: Los cariotipos de las especies del genero Odontophrynus. An. II. Congr. Lat. Amer. Zool. 2, 287?290 (1962).