1. Sonneborn, T.M., Proc. natn. Acad. Sci. USA23 (1937) 378.
2. Miyake, A., in: Biochemistry and Physiology of Protozoa, vol. 4, p. 125. Eds M. Levandowsky and S. H. Hutner. Academic Press, New York 1981.
3. Miyake, A., in: Sexual Interactions in Eukaryotic Microbes, p. 95. Eds D. H. O'Day and P. A. Horgen. Academic Press, New York 1981.
4. Miceli, C., Luporini, P., and Bracchi, P., Acta protozool.20 (1981) 215.
5. Luporini, P., and Miceli, C., Protistologica10 (1984) in press