1. Swanson, C. P., Cytology and Cytogenetics (Prentice-Hall, Inc., Englewood Cliffs, N.J., 1957).
2. Bonner, J., and Ts'o, P. (eds.), The Nucleohistones (Holden-Day, Inc., San Francisco, 1964).
3. Saksela, E., and Moorhead, P. S., Cytogenetics, 1, 225 (1962).
4. Ferguson-Smith, M. A., Ferguson-Smith, M. E., Ellis, P. M., and Dickson, M., Cytogenetics, 1, 325 (1962).
5. Sasaki, M. S., and Makino, S., Amer.J. Human Genet., 15, 24 (1963).