Iskhokov S.A., “Analogue of the first boundary value problem for a nonlinear equation with nonpower degeneracy and a generalized right–hand side”, Doklady Mathematics, 72:3 (2005), 843–845
А. Д. Ляшко, М. Р. Тимербаев, “Вопросы разрешимости и метод конечных элементов вырождающихся эллиптических уравнений высоких порядков”, Изв. вузов. Матем., 1999, № 5, 57–64 ; A. D. Lyashko, M. R. Timerbaev, “Questions of solvability and a finite element method for higher-order degenerate elliptic equations”, Russian Math. (Iz. VUZ), 43:5 (1999), 53–60
Boimatov K.K., Seddighi K., “Boundary problems for the systems of differential equations associated with noncoersive forms”, Doklady Akademii Nauk, 352:3 (1997), 295–297
Iskhokov S.A., “On the smoothness of solutions of degenerating differential equations”, Differential Equations, 31:4 (1995), 594–606
Iskhokov S., “Variational Dirichlet problem for degenerate elliptic equations on half–space”, Doklady Akademii Nauk, 345:2 (1995), 164–167
Boimatov K.K., “Matrix Differential–Operators Associated with Noncoercive Bilinear–Forms”, Doklady Akademii Nauk, 339:1 (1994), 5–10
Boimatov K.K., “The Generalized Dirihlet Problem Associated with Noncoersive Bilinear Form”, Doklady Akademii Nauk, 330:3 (1993), 285–290
Boitmatov K.K., “Generalized Dirihlet Problem for the Systems of Differential–Equations of 2nd–Order”, Doklady Akademii Nauk, 327:1 (1992), 9–15
Miroshin N.V., “On the Dirichlet Variational Problem for Elliptic–Operators Degenerating at the Boundary”, Doklady Akademii Nauk Sssr, 298:5 (1988), 1069–1072
Kaljabin G.A., Lizorkin P.I., “Spaces of Functions of Generalized Smoothness”, Mathematische Nachrichten, 133 (1987), 7–32