@article{RM_1992_47_5_a18,
     author = {S. D. Troitskaya},
     title = {On the spectrum of a~problem of {Sobolev}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {203--204},
     publisher = {mathdoc},
     volume = {47},
     number = {5},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1992_47_5_a18/}
}