1. N. Aronszajn: Theory of reproducing kernelsTrans. Amer. Math. Soc. 68 (1950), 337–404.
2. M. Atteia: Hilbertian Kernels and Spline Functions, North—Holland, Amsterdam, 1992.
3. S. Bergman: The Kernel Function and Conformal Mapping, Math. Surveys AMS V (1950).
4. A. Bouhamidi, A. Le Méhauté: Multivariate interpolating (m,l,$) splines, Adv. Comput. Math. 11 (1999), 287–314.
5. M. D. Buhmann: Radial functions on compact support, Proc. Edinburgh Math. Soc. 41 (1998), 33–46.