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2. Efficient computation of higher Sturm-Liouville eigenvalues;Andrew,1988
3. Finite difference solution of eigenvalue problems;Andrew,1980
4. Computing two-sided bounds for eigenvalues of differential equations;Andrew;Conference on Computational Techniques and Applications,1991
5. Some higher order methods for computing eigenvalues of two-point boundary value problem;Urmani;Communications in Applied Numerical Methods,1987