%0 Journal Article %A G. A. Chechkin %T Asymptotic expansions of eigenvalues and eigenfunctions of an elliptic operator in a domain with many ``light'' concentrated masses situated on the boundary. Two-dimensional case %J Izvestiya. Mathematics %D 2005 %P 805-846 %V 69 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2005_69_4_a7/ %G en %F IM2_2005_69_4_a7