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@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/} }
V. I. Plotnikov; V. Ya. Yakubov. The one-dimensional generalized Sturm-Liouville problem. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1968), pp. 70-81. http://geodesic.mathdoc.fr/item/IVM_1968_12_a8/