1. Spline Functions and Multivariate Interpolations;Bojanov,1993
2. Multivariate Approximation Theory: Selected Topics;Cheney,1986
3. Multivariate Splines;Chui,1988
4. On Chebyshev an almost Chebyshev subspaces;Garkavi;Izv. Akad. Nauk SSSR Ser. Mat.,1964
5. Almost Chebyshev systems of continuous functions;Garkavi;Izv. Vyssh. Uchebn. Zaved. Mat.,1965