1. Berger S, Schweiger HG (1980) In: Gantt E (ed) Handbook of Phycological Methods Cambridge University Press, pp 47?57
2. Clauss H, Werz G (1961) Z Naturforsch 16 b: 162?165
3. Hämmerling J (1932) Biol Zentralbl 52: 42?61
4. Kloppstech K, Schweiger HG (1975) Differentiation 4: 115?123
5. Kloppstech K, Schweiger HG (1977) In: Woodcock CL (ed) Progress in Acetabularia Research, Academic Press, New York San Francisco, London, pp 19?32