1. Arnoldy, W., Beitrage zur Morphologie der Gymnospermen. 4. Was sind die “Keimbläschen” oder “Hofmeisters-Körperchen” in der Eizelle der Abietineen?, Flora, 1900, vol. 87, pp. 194–204.
2. Koernicke, M., Uber ortsveranderung von Zellkarnern S.B. Niederhein, Ges Natur-U Heilkunde Bonn A, 1901.
3. Gates, R.R., Pollen formation in Oenothera gigas, Ann. Bot., 1911, vol. 25, no. 4, pp. 909–940.
4. Gottschalk, W., Chromosome and nucleus migration during microsporogenesis of Pisum satium, Nucleus, 1970, vol. 13, no. 1, pp. 1–9.
5. Bellucci, M., Roscini, C., and Mariani, A., Cytomixis in pollen mother cells of Medicago sativa L, J. Hered., 2003, vol. 94, no. 6, pp. 512–516.