@article{NUMA_1986__50_133148,
     author = {Alan L. Andrew and John W. Paine},
     title = {Correction of {Finite} {Element} {Estimates} for {Sturm-Liouville} {Eigenvalues.}},
     journal = {Numerische Mathematik},
     pages = {205--216},
     publisher = {mathdoc},
     volume = {50},
     year = {1986},
     zbl = {0588.65062},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1986__50_133148/}
}