1. A. N. Tikhonov and A. A. Samarskii, Equations of Mathematical Physics (Nauka, Moscow, 1999; Dover, New York, 2011).
2. N. M. Gunther, Potential Theory and Its Application to the Fundamental Problems of Mathematical Physics (Ungar, New York, 1967).
3. D. Colton and R. Kress, Integral Equation Methods in Scattering Theory (Wiley, New York, 1984).
4. C. A. Brebbia, J. C. F. Telles, and L. C. Wrobel, Boundary Element Techniques: Theory and Applications in Engineering (Springer-Verlag, Berlin, 1984).
5. P. A. Krutitskii, A. D. Fedotov, and V. V. Kolybasova, “Quadrature formula for the simple layer potential,” Differ. Equations 55 (9), 1226–1241 (2019).