1. Spline Functions: Basic Theory;Schumaker,2007
2. On variation diminishing approximation methods;Schoenberg,1959
3. An identity for spline functions with applications to variation-diminishing spline approximation
4. Direct estimates and Bernstein-type inequalities for Schoenberg splines;Gonska,2002
5. On variation-diminishing Schoenberg operators: New quantitative statements;Beutel;Monogr. Acad. Cienc. Zaragoza,2002