S. A. Abdo, N. J. Yurchuk, “Multipoint boundary value problems for certain operator-differential equations. II. Solvability and properties of the solutions”, Differ. Uravn., 21:5 (1985), 806–815
2.
S. A. Abdo, N. J. Yurchuk, “Multipoint boundary value problems for certain operator-differential equations. I. A priori estimates”, Differ. Uravn., 21:3 (1985), 417–425
