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3. The Padé Table and the τ-Method;Luke;Journ. Math. Phys.,1958
4. On Approximate Expressions for the Exponential Integral and the Error function;Bellman;Journ. Math. Phys.,1952
5. Sur la Representation Approchée d'une Fonction par Des Fractions Rationnelles;Padé;Ann. de L'Ec. Nor.,1892