A two-dimensional minimum-derivative spline
The construction of a \(C^{(1,1)}\) interpolation parabolic spline function of two variables on a uniform rectangular grid is given such that this function is a minimum-derivative one-dimensional quadratic spline in one of the variables, and the spline coefficients themselves are minimum-derivative quadratic spline functions of the other variable.
scientific article; zbMATH DE number 5834377