Spline spaces are optimal for L² n-width

H.N. Mhaskar, Charles A. Micchelli

Advances in Applied Mathematics

H. Prautzsch, Charles A. Micchelli

Computer Aided Geometric Design

Wolfgang Dahmen, Charles A. Micchelli

Proceedings of the American Mathematical Society

Martin D. Buhmann, Charles A. Micchelli

Computers and Mathematics with Applications