1. Yu. E. Boyarintsev, Regular and Singular Systems of Linear ODEs (Nauka, Novosibirsk, 1980) [in Russian].
2. Jr. Y. Sibuya, “Some global properties of matrices of one variable,” Math. Ann. 61 (1), 67–77 (1965).
3. A. N. Konovalov, The Problem of Filtering of Multiphase Incompressible Fluid (Nauka, Novosibirsk, 1988) [in Russian].
4. Comments on an implicit difference scheme approximating the system of Stokes equations;Yu. E. Boyarintsev,1983
5. E. P. Serov and B. P. Korol’kov, Dynamics of Steam Generator (Energoizdat, Moscow, 1981) [in Russian].