L. A. KOTOK, R. Yu. ITSKOVICH, E. K. SALIYCHUK, L. A.,DEINEKA T. G. KVICHKO, T. S. TEPLITSKAYA, and G. Kh. ROSENBERG, Ways to increase the critical temperature in B╕ and Tl systems, Low Temp. Phys. 16, (1990) [Fiz. Nizk. Temp. 16, 630-631, (1990)].