1. Ashmarin, I. P.: To the problem of investigation of histone effects on tumor developmentin vivo. In: Materiali k Vsesojuznomu simpoziumu ?Problemi chimii v oncologii? (Materials to All-Union Symposium ?Chemical Problems in Oncology?), in Russian, pp. 78?79. Leningrad, 1968.
2. Bush, H.: Histones and other Nuclear Proteins. New York-London: Academic Press, 1965.
3. Chirigos, M., K. Perk, W. Turner, B. Burka, andM. Comes: Increased oncogenicity of the murine sarcoma virus (Moloney) by co-infection with murine leukemia viruses. Cancer Res.28, 1055?1073 (1968).
4. Craighead, J. E.: Polycation effect on virulence of nonpathogenic r variant of the encephalomyocarditis virus. Nature (Lond.)214, 716?717 (1967).
5. Fefer, A., J. L. McCoy, J. P. Glynn, andK. Perk: Induction and regression of primary Moloney sarcoma virus-induced tumors in mice. Cancer Res.27, 1626?1631 (1967).