%0 Journal Article %A A. M. Leontovich %T Rate of convergence in the ``circle formation'' problem %J Sbornik. Mathematics %D 1972 %P 89-118 %V 17 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1972_17_1_a4/ %G en %F SM_1972_17_1_a4