@article{DE_1976_12_10_a11,
     author = {N. M. Krukovskii},
     title = {Theorems on the $m$-fold completeness of the generalized eigen- and associated functions from $W_2^1$ of certain boundary value problems for elliptic equations and systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1842--1851},
     publisher = {mathdoc},
     volume = {12},
     number = {10},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_10_a11/}
}