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@article{IVM_1983_5_a13, author = {M. A. Zaretskaya}, title = {The spectrum of a~class of differential operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {76--78}, publisher = {mathdoc}, number = {5}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1983_5_a13/} }
M. A. Zaretskaya. The spectrum of a~class of differential operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1983), pp. 76-78. http://geodesic.mathdoc.fr/item/IVM_1983_5_a13/