@article{DAN_1980_255_5_a6,
     author = {F. S. Rofe-Beketov},
     title = {Perturbations and {Friedrichs} extensions of semibounded operators on variable domains},
     journal = {Doklady Akademii Nauk},
     pages = {1054--1058},
     publisher = {mathdoc},
     volume = {255},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_5_a6/}
}