1. Arey, L. B.: Developmental anatomy, 6th edit., pp. 24, 28, 316. Philadelphia and London: W. B. Saunders Company 1954.
2. Ashbel, R., and A. M. Seligman: A new reagent for the histochemical demonstration of active carboxyl groups. A new method for staining ketonic steroids. Endocrinology 44, 565 (1949).
3. BAILEY’S tectbook of histology, revised by P. E. Smith and W. M. Copenhaver, p 551. Baltimore, Maryland: Williams & Wilkins Company 1948.
4. Barr, M. L.: Sex chromatin and phenotype in man. Science 130, 679 (1959).
5. Berthold, A. A.: Transplantation der Hoden. Arch. Anat., Physiol. u. wiss. Med. 1849, 42–26.