@article{IVM_1968_12_a8,
     author = {V. I. Plotnikov and V. Ya. Yakubov},
     title = {The one-dimensional generalized {Sturm-Liouville} problem},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {70--81},
     publisher = {mathdoc},
     number = {12},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_12_a8/}
}