David Cubanski David Cyganski Multivariate Classification through Adaptive Delaunay-Based C0 Spline Approximation. 403-417 1995 17 IEEE Trans. Pattern Anal. Mach. Intell. 4 http://www.computer.org/tpami/tp1995/i0403abs.htm db/journals/pami/pami17.html#CubanskiC95