@article{DAN_1960_132_6_a3,
     author = {G. V. Virabyan},
     title = {The spectral equivalence of two operators generated by a certain class of {Sobolev's} differential equation systems},
     journal = {Doklady Akademii Nauk},
     pages = {1238--1241},
     publisher = {mathdoc},
     volume = {132},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_6_a3/}
}