@article{IM2_2005_69_4_a7,
     author = {G. A. Chechkin},
     title = {Asymptotic expansions of eigenvalues and eigenfunctions of an elliptic operator in a domain with many {\textquotedblleft}light{\textquotedblright} concentrated masses situated on the boundary. {Two-dimensional} case},
     journal = {Izvestiya. Mathematics},
     pages = {805--846},
     year = {2005},
     volume = {69},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2005_69_4_a7/}
}