1. V. L. Rvachev and V. A. Rvachev, Nonclassical Methods of Approximation Theory in Boundary-Value Problems [in Russian], Naukova Dumka, Kiev (1979).
2. V. A. Rvachev, “Compactly-supported solutions of functional-differential equations and their applications,” UMN, 45, No. 1 (271), 77–103 (1990).
3. Yu. G. Stoyan, V. S. Protsenko, G. P. Man’ko, et al., Theory of R-Functions and Current Problems of Applied Mathematics [in Russian], Naukova Dumka, Kiev (1986).
4. V. M. Kolodyazhny and V. O. Rvachov, “Compactly supported functions generated by the Laplace operator,” Dop. NAN Ukr., No. 4, 17–22 (2004).
5. V. M. Kolodyazhny and V. O. Rvachov, “Using the atomic function Plop(x, y) in solving boundary-value problems for the Laplace equation,” Dop. NAN Ukr., No. 9, 16–21 (2006).