%0 Journal Article %A L. V. Hörmander %T On the singularities of solutions of partial differential equations %J Matematika %D 1972 %P 33-59 %V 16 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAT_1972_16_6_a1/ %G ru %F MAT_1972_16_6_a1