1. Yu. L. Zhitnukhin and V. M. Pleskov, Vopr. Med. Khimii, No. 1, 57 (1978).
2. M. G. Khizhnyak, Yu. L. Zhitnukhin, and G. V. Konovalov, Arkh. Patol., No. 3, 54 (1987).
3. J. Colover, Br. J. Exp. Pathol.,61, 390 (1980).
4. G. A. Hashim, Gerontology,33 No. 3, 181 (1987).
5. P. J. Higgins and H. L. Weiner, J. Immunol.,140, No. 2, 440 (1988).