1. Allfrey, V. G., A. E. Mirsky, and H. Stern: The chemistry of the cell nucleus. Advanc. Enzymol. 16, 411?500 (1955).
2. Atkin, N.B., and B. M. Richards: Desoxyribonucleic acid in human tumours as measured by microspectrophotometry of Feulgen stain: a comparison of tumours arising at different sites. Brit. J. Cancer 10, 769?786 (1956).
3. ?, G. Mattinson, W. Beçak, and S. Ohno: The comparative DNA content of 19 species of placental mammals, reptiles and birds. Chromosoma (Berl.) 17, 1?10 (1965).
4. - - and M. C. Baker: A comparison of the DNA content and chromosome number of 50 human tumours. Brit. J. Cancer (in press).
5. Atz, J. W.: Intersexuality in fishes (chapt. 3, p. 145?232) in intersexuality in vertebrates including man, edit. by C. N. Armstrong, and A. G. Marshall. London and New York: Academic press 1964.