7Stein E M, Weiss G. Introduction to fourier analysis on euclidean spaces [ M ]. Princeton, New Jersey : Princeton University Press, 1971, 14:133 - 137.
8Wendland Holger. Piecewise polynomial, positive definition and compactly supported radial functions of minimal degree [ J ]. Advance in Comp. Math. , 1995,4 (4) :389 - 396.
9Dyn N. Interpolation of scattered data by radial functions [ A ]. Topics in Multivariate Approximation[ C ]. C K Chui, L L Schumaker, and F I Utrrtas( eds. ) Academic Press, 1987,47 - 61.
10Powell M J D. Radial basis functions for muhivariable interpolation : a review [ A ]. Numerical Analysis [ C ]. Griffiths D F, Watson G A eds : Harlow I.ongman Scientific & Technical, 1987,223 - 241.