1. Introduction to Approximation Theory;Cheney,1966
2. Approximation of Functions;Lorentz,1966
3. Analytic Theory of Continued Fractions;Wall,1948
4. On approximation to an analytic function by rational functions of best approximation;Walsh;Math. Z.,1934
5. Padé approximants as limits of rational functions of best approximation;Walsh;J. Math. Mech.,1964