@article{MMO_1960_9_a16,
     author = {R. A. Aleksandryan},
     title = {Spectral properties of operators arising from systems of differential equations of {Sobolev} type},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {455--505},
     publisher = {mathdoc},
     volume = {9},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1960_9_a16/}
}