1. Theory of Approximation;Achieser,1956
2. Introduction to Approximation Theory;Cheney,1966
3. Interpolation and Approximation;Davis,1963
4. On the computation of rational approximations to continuous functions;Fraser;Comm. ACM.,1962
5. Die Minkowskische Geometrie und die Annäherung an stetige Funktionen;Haar;Math. Ann.,1918