1. I. P. Ashmarin and A. A. Vorob'ev, Statistical Methods in Microbiological Research [in Russian], Leningrad (1962).
2. O. V. Bukharin, ?Stimulation of natural resistance of the organism to infection by drugs,? Author's Abstract of Doctoral Dissertation, Leningrad (1969).
3. T. G. Vasil'eva, Dokl. Akad. Nauk SSSR,184, 225 (1969).
4. T. G. Vasil'eva, G. I. Sazonets, and N. I. Shapiro, Dokl. Akad. Nauk SSSR,221, 711 (1973).
5. M. V. Voino-Yasenetskii and M. K. Voino-Yasenetskaya, in: Problems in Infectious Pathology [in Russian], Leningrad (1962), p. 19.