1. Matsumura, S., and Mochizuki, A., Jap. J. Genet., 28, 47 (1953).
2. Tjio, J. H., and Levan, A., Anales Estacion Exp. Aula Dei, 2, 21 (1950).
3. Mochizuki, A., Reprint with English summary from Rep. Hokkaidô Sugar Beet Prod. Pyom, Assoc., 3, 14 (1953).