A. Portnyagin

发表

V. N. Parygin, S. Pak, A. Portnyagin, 1982 .

A. Portnyagin, M. B. Zhitkova, V. Klushin, 1972 .

V. Gusev, A. Portnyagin, E. Kozlova, 1987 .

Alexander A. Karabutov, Oleg V. Rudenko, Elena B. Cherepetskaya, 1978 .