@article{DE_1974_10_2_a14,
     author = {O. A. Liskovets},
     title = {Calculation of the values of a closed unbounded operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {290--300},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_2_a14/}
}