@article{SM_1977_32_2_a3,
     author = {A. M. Il'in},
     title = {A~boundary value problem for the second order elliptic equation in a~domain with a~narrow slit. {2.~Domain} with a~small cavity},
     journal = {Sbornik. Mathematics},
     pages = {227--244},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1977_32_2_a3/}
}