P. E. Sobolevskii, È. A. Shteynvil, “An approach to the solution of ill-posed problems”, Differ. Uravn., 14:5 (1978), 900–904
1974
2.
P. E. Sobolevskii, È. A. Shteynvil, “The correct solvability of an extended boundary value problem for a parabolic equation”, Differ. Uravn., 10:9 (1974), 1692–1698