1. Stanier, R. Y., Doudoroff, M., and Adelberg, E. A., General Microbiology (3rd ed.), 51 (Macmillan, London, 1971).
2. Margulis, L., Origin of Eukaryotic Cells (Yale Univerity Press, New Haven, 1970).
3. Stanier, R. Y., Symp. Soc. gen. Microbiol., 24, 219–240 (1974).
4. Krogmann, D. W., in The Biology of the Blue-Green Algae (edit. by Carr, N. G., and Whitton, B. A.), 80–98 (Blackwell, Oxford, 1973).
5. Davenport, H. E., and Hill, R., Proc. R. Soc., Lond., B 139, 327–345 (1952).