%0 Journal Article %A A. Szpirglas %T Boundary Singularities and Symmetric Boundary Singularities %J Funkcionalʹnyj analiz i ego priloženiâ %D 1994 %P 79-82 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1994_28_2_a16/ %G ru %F FAA_1994_28_2_a16