1. Ar-rushdi, A. H.: The polygenic basis of sex-ratio in Tigriopus. (Abstract.) Proc. of the X. Int. Congr. of Genetics. II, 8 (1958).
2. Beermann, W.: Weibliche Heterogametie bei Copepoden. Chromosoma (Berl.) 6, 381?396 (1954).
3. Cooper, K. W.: Normal segregation without chiasmata in female Drosophila melanogaster. Genetics 30, 472?484 (1945).
4. Darlington, C. D.: Recent advances in cytology, 2nd ed. Philadelphia: Blackiston 1937.
5. Daville, A., and J. De Beaumont: Recherches sur les chromosomes des Neuropt�res. Arch. Anat. micr. 29, 199?243 (1933).