A. A. Bolibrukh, A. G. Vitushkin, V. S. Vladimirov, E. F. Mishchenko, S. P. Novikov, Yu. S. Osipov, A. G. Sergeev, P. L. Ul'yanov, L. D. Faddeev, E. M. Chirka, “Andrei Aleksandrovich Gonchar (on his 70th birthday)”, Russian Math. Surveys, 57:1 (2002), 191–198
È. M. Saak, “A capacity criterion for a domain with stable Dirichlet problem for higher order elliptic equations”, Math. USSR-Sb., 29:2 (1976), 177–185