@article{GDZPPN001172409, title = {High Order Approximations to Sturm-Liouville Eigenvalues.}, journal = {Numerische Mathematik}, volume = {25}, year = {1975}, pages = {241-248}, zbl = {0298.65058}, url = {http://dml.mathdoc.fr/item/GDZPPN001172409} }
Pruess, S. High Order Approximations to Sturm-Liouville Eigenvalues.. Numerische Mathematik, Tome 25 (1975) pp. 241-248. http://gdmltest.u-ga.fr/item/GDZPPN001172409/