1. Roussey, G.K., Experientia, 16, (1960),329
2. Roussey, G.K., Agressologie, 120,(1971),13
3. Roussey, G.K., in: Programme of Embryonic Development Directed by Ontogenines, Sofia, Naouka i Izkoustvo, (1974), P.302 /in Bulgarian/
4. Turkington, R.W., Ward, O.T., BBA, 174,1,(1969),282
5. Lindahl, T., in: Methods in Enzymology, vol.XXI, Part D,(1971), 333