1. Norman Bazley,Lower bounds for eigenvalues with application to the helium atom, Proc. Nat. Acad. Sci., 45, pp. 850–853, 1959.
2. Norman Bazley,Lower bounds for eigenvalues, J. Math. Mech., Vol. 10, No. 2, pp. 289–307, 1961.
3. G. Blanch,On the Computation of Mathieu Functions, J. Math. and Phys., Vol. XXV, No. 1, pp. 1–20, 1946.
4. G. Blanch and I. Rhodes,Table of characteristic values of Mathieu's equation for large values of the parameter, J. Washington Acad. Sci., Vol. 45, No. 6, pp. 166–196, 1955.
5. G. Blanch,Numerical Evaluation of Continued Fractions, SIAM Rev., Vol. 6, No. 4, pp. 383–421, 1964.