1. : Spectral Properties of Diffraction Problems. In: N. Voitovich, B. Kazenelenbaum, and A. Sivov (Ed.), Generalized Method of Eigenoscillation in the Diffraction Theory, p. 279-281, Nauka, Moscow, 1977 (Russian)
2. : Ordinary Differential Equations, Springer-Verlag, Heidelberg, 1992 (English). Russian original: 3-rd edition, Nauka, Moscow, 1984
3. Asymptotics for Elliptic Boundary Value Problems for Systems of Pseudo-differential Equations
4. and : General Theorems on the Factorization of Matrix-Functions, II Certain Tests and Their Consequences, Mathematicheskie Issledovania 3, iss. 3, p. 3-18, Kishirev, Stiinca, 1968
5. and : Development of the Method of a Potential in the Theory of Elasticity, Tbilisi, Metsniereba, 1985 (Russian)