by N.N. Bogolubov, A.A. Logunov, I.T. Todorov ; authorized translation from the Russian ms. by Stephen A. Fulling and Ludmila G. Popova ; edited by Stephen A. Fulling. -- 1st English ed.. -- W.A. Benjamin, 1975. -- (The mathematical physics monograph series / A.S. Wightman, editor ; 18).