1. K. E. Brenan, S. L. Campbell, and L. R. Petzold, Numerical Solution of Initial-Value Problems in Differential-Algebraic Equations (SIAM, Philadelphia, 1996).
2. Yu. E. Boyarintsev and V. F. Chistyakov, Differential Algebraic Equations: Methods for Numerical Solution and Study (Nauka, Novosibirsk, 1998) [in Russian].
3. N. N. Luzin, “Study of a matrix system in the theory of differential equations,” Avtom. Telemekh., No. 5, 4–66 (1940).
4. F. R. Gantmacher, The Theory of Matrices (Chelsea, New York, 1959; Fizmatgiz, Moscow, 1966).
5. Yu. E. Boyarintsev, Regular and Singular Systems of Linear Ordinary Differential Equations (Nauka, Novosibirsk, 1980) [in Russian].