1. A.G. Merzhanov, I.P. Borovinskaya and V.M. Shkiro, Diploma No. 287, Prior. 05.07.67
2. A.G. Merzhanov, V.M. Shkiro and I.P. Borovinskaya, Pat. France, 1972, No. 2088668; Pat. USA, 1973, No. 2726643; Pat. England, 1974, No. 1321084; Pat. Japan, 1982, No. 1098839.