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2. Sur la meilleure approximation de |x|p par des polynômes de degrés trés élevés;Bernstein;Bull. Acad. Sci. USSR, Sér. Math.,1938
3. On the best approximation of continuous functions on the real axis by means of entire functions of given degree 5;Bernstein;Dokl. Akad. Nauk SSSR,1946
4. Odd-degree spline interpolation at a bi-infinite knot sequence;de Boor,1976
5. Interpolation and Approximation;Davis,1963