@article{CMUC_1971__12_2_a2,
     author = {Najzar, Karel},
     title = {Error bounds for eigenvalues and eigenfunctions of some ordinary differential operators by the method of least squares},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {235--248},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1971},
     mrnumber = {0290580},
     zbl = {0216.49001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a2/}
}