1. Crick, F. H. C., and A. F. W. Hughes, 1950: Expt. Cell. Res.1, 37.
2. Fujii, K., 1931: Cytology in the past and present. Iwanamo-Kozi (Tokyo 1931): japan., cit. nach Tischler.
3. Gates, R. R., 1912: Ann. of Bot.26, 995.
4. Heilbrunn, L. V., 1928: The colloid chemistry of protoplasm. Berlin, Gebr. Borntraeger.
5. Heilbrunn, L. V., 1953: An outline of general physiology, 3rd ed. Philadelphia and London, W. B. Saunders & Co.