1. S. A. Aivazyan, I. S. Enyukov, and L. D. Meshalkin, Applied Statistics [in Russian], Moscow (1983).
2. V. Ya. Brodskii, Tsitologiya,18, 397 (1976).
3. S. N. Bykovskaya and E. V. Gruntenko, T-Lymphocytes in Antitumor Immunity [in Russian], Novosibirsk (1982).
4. A. Böyum, Scand. J. Clin. Lab. Invest., Suppl. 97, 51 (1968).
5. S. G. Emerson, J. Pretell, and R. E. Cone, Exp. Clin. Immunogenet.,1, 9 (1984).