@article{ARM_1998__34_1_a6,
     author = {Elbert, \'Arp\'ad and Kusano, Taka\^{s}i and Naito, Manabu},
     title = {Singular eigenvalue problems for second order linear ordinary differential equations},
     journal = {Archivum mathematicum},
     pages = {59--72},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1998},
     mrnumber = {1629660},
     zbl = {0914.34021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1998__34_1_a6/}
}