1. Chan, P. C. &Cohen, L. A. (1974) Effect of dietary, fat, antiestrogen, and antiprolactin on the development of mammary tumors in rats.J. natn Cancer Inst. 52, 25?30.
2. Dao, T. L. (1969) Mammary cancer induction by 7,12-dimethylbenz(a)anthracene: Relation to age.Science 165, 810?11.
3. Dunn, T. B. (1970) Normal and pathologic anatomy of the adrenal gland of the mouse, including neoplasms.J. natn Cancer Inst. 44, 1323?89.
4. Frantz, M. J. &Kirschbaum, A. (1949) Sex hormone secretion by tumours of the adrenal cortex of mice.Cancer Res. 9, 251?66.
5. Gomori, G. (1936) Microtechnical demonstration of iron.Am. J. Path. 12, 655?63.