1. Kakpakov, V.T., Gvozdev, V.A., Platova, T.P., and Polukalova, L.G. (1969).Genetika 5:67?75; English translation:Soviet Genet. 5:1647?1655.
2. Echalier, G., and Ohanessian, A. (1969).C.R. Acad. Sci. (Paris) D 268:1771?1773.
3. Echalier, G., and Ohanessian, A. (1970).In Vitro 6:162?172.
4. Courgeon, A.M. (1972).Exp. Cell Res. 74:327?336.
5. Schneider, I. (1972).J. Embryol. Exp. Morphol. 27:353?365.