@article{DAN_1987_294_2_a16,
     author = {I. Yu. Popov},
     title = {A slit of zero width and the {Dirichlet} condition},
     journal = {Doklady Akademii Nauk},
     pages = {330--334},
     publisher = {mathdoc},
     volume = {294},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_2_a16/}
}