1. A. G. Kasatkin (ed.), Liquid Extraction (Theory and Practice), Collection of Articles [in Russian], Khimizdat, Moscow (1958).
2. S. M. Karpacheva, At. Energ.,47, No. 5, 324 (1979).
3. S. D. Beshelev and F. G. Gurvich, Mathematicostatistical Methods of Ratings [in Russian], Statistika, Moscow (1974).
4. G. J. Hahn and S. S. Shapiro, Statistical Models in Engineering, Wiley (1967).