%0 Journal Article %A Yuri Egorov %T Removable singularities in the boundary conditions %J Banach Center Publications %D 1992 %P 137-140 %V 27 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/-27-1-137-140/ %R 10.4064/-27-1-137-140 %G en %F 10_4064__27_1_137_140