1. Balfour, F.M.: A treatise on comparative embryology. Vol. I. London: MacMillan 1980
2. Boterenbrood, E.C.: Urodeles. In: The UFAW handbook on the care and management of laboratory animals (UFAW ed.). Edinburgh: Churchill Livingstone 1972
3. Boterenbrood, E.C., Nieuwkoop, P.D.: The formation of the mesoderm in urodelean amphibians. V. Its regional induction by the endoderm. Wilhelm Roux' Archiv173, 319?332 (1973)
4. Chulitskaia, E.V.: Onset of desynchronization and change in the rhythm of nuclear division in the cleavage period. Doklady Akademii Nauk SSSR173, 1473?1476 (163?166 in English translation) (1967)
5. Chulitskaia, E.V.: Desynchronization of cell divisions in the course of egg cleavage and an attempt at experimental shift of its onset. J. Embryol. exp. Morph.23, 359?374 (1970)