@article{DE_1977_13_7_a27,
     author = {N. M. Krukovskii},
     title = {Letter to the editors: {``Theorems} on the $m$-fold completeness of the generalized eigen- and associated functions from $W_2^1$ 
},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1344},
     publisher = {mathdoc},
     volume = {13},
     number = {7},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a27/}
}