1. Badian, J.: Bull. Internat. Acad. Polonaise, B 1, 61 (1937).
2. Bretschneider, L. H.: Internat. Rev. Cytology 1, Academic Press Inc. New York, 1952.
3. Darlington, C. D.: Recent Advances in Cytology. London, J. & A. Churchill 1937.
4. Darlington, C. D., and L. F. La Cour: The Handling of Chromosomes. London, Allen and Unwin Ltd 1950.
5. Duraiswami, S.: Cellule 55, 381 (1953).