1. R. S. Anderssen and F. R. De Hoog,On the correction of finite difference eigenvalue approximations for Sturm-Liouville problems with general boundary conditions, Tech. Rep. CMA-RO5-82, Centre for Math. Analysis, Australian National Univ., 1982.
2. R. S. Anderssen and F. R. De Hoog,On the correction of finite difference eigenvalue approximations for Sturm-Liouville problems with general boundary conditions, BIT 24 (1984), 401–412.
3. A. L. Andrew,Numerical solution of eigenvalue problems for ordinary differential equations, Computational Techniques and Applications: CTAC-83, J. Noye and C. Fletcher, eds., North-Holland, Amsterdam, 1984, 841–852.
4. A. L. Andrew,Asymptotic correction of finite difference eigenvalues, Computational Techniques and Applications: CTAC-85, J. Noye and R. May, eds., North-Holland, Amsterdam 1986, 333–341.
5. A. L. Andrew and J. W. Paine,Correction of Numerov's eigenvalue estimates, Numer. Math. 47 (1985), 289–300.