@article{DAN_1978_241_4_a3,
     author = {O. A. Liskovets},
     title = {The smoothing functional principle for regularizing equations with a closed operator},
     journal = {Doklady Akademii Nauk},
     pages = {757--760},
     publisher = {mathdoc},
     volume = {241},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_241_4_a3/}
}