1. Observations on the structure of the reproductive organs of the box turtle;Altland;J. Morphol,1951
2. Progesterone-like activity in the plasma of ovoviviparous snakes;Bragdon,1954
3. Ovarian changes;Brambell,1956
4. Gonadal steroid synthesis in the snake Natrix sipedon pictiventris;Callard,1966
5. In vitro steroid synthesis by the ovaries of elasmobranchs and snakes;Callard;Arch. Anat. Microscop. Morphol. Exp,1965