1. Theory of reproducing kernels;Aronszajn;Trans. Amer. Math. Soc.,1950
2. The Mathematical Theory of Finite Element Methods;Brenner,1994
3. Adaptive least squares fitting with radial basis functions on the sphere;Fasshauer,1995
4. Scattered data fitting on the sphere;Fasshauer,1998
5. Constructive Approximation on the Sphere;Freeden,1998