1. E. V. Gubler and A. A. Genkin, The Use of Criteria of Nonparametric Statistics for the Assessment of Differences between Two Groups of Observations in Medico-Biological Research [in Russian], Moscow (1969), p. 8.
2. L. M. Shabad, G. A. Belitskii, and T. A. Bogush, Z. Krebsforsch.,82, 13 (1974).
3. L. M. Shabad, et al., Arzneimittel-Forsch.,24, 1177 (1974).
4. L. M. Shabad, T. A. Bogush, and G. A. Belitskii, Neoplasma (Bratislava),22, 347 (1975).
5. A. Alonso and G. Herranz, Naturwissenschaften,57, 249 (1970).