@article{EJDE_1994__1994_6_a0,
     author = {Dwyer,  H.I. and Zettl,  A.},
     title = {Computing eigenvalues of regular {Sturm-Liouville} problems},
     journal = {Electronic journal of differential equations},
     year = {1994},
     volume = {1994},
     number = {6},
     zbl = {0810.34020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1994__1994_6_a0/}
}