1. Adams, C. E. and Chang, M. C. (1962). J. exp. Zool. 151, 159–166
2. Albers, H. J., Bedford, J. M. and Chang, M. C. (1961). Am. J. Physiol. 201, 554–556
3. Allen, E., Danforth, C. H. and Doisy, E. A. (Editors) (1939). Sex and Internal Secretions, 2nd edn. Baltimore; Williams & Wilkins
4. Austin, C. R. (1951). Aust. J. Sci. Res. B 4, 581–596
5. Austin, C. R. (1952). Nature, Lond. 170, 326–327