1. Baltzer, F.: Die Chromosomen von Strongylocentrotus lividus und Echinus microtuberculatus. Arch. Zellforsch. 2, 549?632 (1909)
2. Molecular and cellular biology, series II;B. J. DuPraw,1970
3. Ephrussi, B., Scaletta, L. S., Stenchevan, M. A., Yoshida, M. C.: Hybridization of somatic cells in vitro. In: Cytogenetics of cells in culture (R. S. C. Harris, ed.) p. 13?25. New York: Academic Press 1964
4. Gläss, E.: Die Identifizierung der Chromosomen im Karyotyp der Rattenleber. Chromosoma (Berl.) 7, 655?669 (1957)
5. Harris, H., Watkins, S. F.: Hybrid cells derived from mouse and man; artificial heterokaryons of mammalian cells from different species. Nature (Lond.) 205, 640?646 (1965)