放射基底関数
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Hardy, R.L., Multiquadric equations of topography and other irregular surfaces. Journal of Geophysical Research, 76(8):1905–1915, 1971.
Hardy, R.L., 1990, Theory and applications of the multiquadric-biharmonic method, 20 years of Discovery, 1968 1988, Comp. math Applic. Vol 19, no. 8/9, pp. 163 208
Press, WH; Teukolsky, SA; Vetterling, WT; Flannery, BP (2007), “Section 3.7.1.