Literature cited
N. I. Kamakin and A. A. Sychev, Authors Certificate No. 304,097, Otkrytiya, Izobreteniya, Promysh. Obraztsy, Tovar. Znaki, No. 17 (1971).
Additional information
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, pp. 27–28, July, 1975.