%0 Journal Article %A Yu. G. Shondin %T About semiboundness of $\delta$-perturbations of the Laplacian supported by curves with angle points %J Teoretičeskaâ i matematičeskaâ fizika %D 1995 %P 3-17 %V 105 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1995_105_1_a0/ %G ru %F TMF_1995_105_1_a0