1. A. A. Samarskii, I. E. Kaporin, A. B. Kucherov, and E. S. Nikolaev, “Some modern methods of solving grid equations,”Izv. Vuzov. Matem., No. 7(254), 3–12 (1963).
2. S. I. Solov’ev, “Fast methods of solving finite-element grid schemes of second-order precision for the Poisson equation in a rectangle,”Izv. Vuzov. Matem., No. 10(281), 71–74 (1985).
3. S. I. Solov’ev, “The Fourier method for finite-element approximation of the Poisson equation,” in:Grid Methods of Solving Differential Equations [in Russian], Kazan (1986), pp. 64–78.
4. P. Lancaster,Theory of Matrices [Russian translation], Moscow (1982).