On the least squares fit by radial functions to multidimensional scattered data - Sivakumar, N.; Ward, J. D. (Numerische Mathematik, 1993)
Keywords: Approximations and expansions; Exact sciences and technology; Mathematical analysis; Mathematics; Sciences and techniques of general use; Approximation by function; Interpolation; Upper bound; Inverse matrix; Multidimensional space; Least squares method