1. V. I. Gel'shtein, Vopr. Onkol., No. 10, 58 (1961).
2. N. I. Golub', T. S. Kolesnichenko, and L. M. Shabad, Byull. Éksp. Biol. Med., No. 12, 62 (1974).
3. T. S. Kolesnichenko and N. V. Popova, Byull. Éksp. Biol. Med., No. 9, 1116 (1976).
4. N. V. Popova, Byull. Éksp. Biol. Med., No. 6, 732 (1977).
5. G. N. Titova, ?Experimental carcinogenesis of the liver of certain mammals at different stages of ontogeny,? Author's Abstract of Candidate's Dissertation, Leningrad (1973).