1. M. Abramowitz andI.A. Stegun,Handbook of Mathematical Functions (Dover, New York 1965).
2. F. Bowman,Introduction to Elliptic Functions (English Universities Press, London 1953).
3. E.T. Copson,An Introduction to the Theory of Functions of a Complex Variable (Oxford University Press, London 1955).
4. G. Fix,Higher-Order Rayleigh Ritz Approximations, J. Math. Mech.18, 645–657 (1969).
5. L. Fox andR. Sankar,Boundary Singularities in Linear Elliptic Differential Equations, J. Inst. Math. Applics.5, 340–350 (1969).