@article{DE_2002_38_6_a6,
     author = {M. V. Korovina},
     title = {The {Construction} of a {Self-Adjoint} {Extension} of the {Schr\"odinger} {Operator} with {Potential} {Concentrated} on a {Pencil} of {Planes:} {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {775--786},
     publisher = {mathdoc},
     volume = {38},
     number = {6},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_6_a6/}
}