%0 Journal Article %A S. A. Nazarov %T ``Far-field interaction'' of concentrated masses in~two-dimensional Neumann and Dirichlet problems %J Izvestiya. Mathematics %D 2023 %P 61-112 %V 87 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2023_87_1_a3/ %G en %F IM2_2023_87_1_a3