1. Transcendental Functions;Babister,1967
2. The Numerical Solution of Elliptic Equations;Birkhoff,1971
3. Accurate Eigenvalue Computations for Elliptic Equations;Birkhoff,1970
4. Durand, “Electricité,” Dunod, Paris.
5. Higher-order Rayleigh-Ritz approximations;Fix;J. Math. Mech.,1969