@article{MAT_1972_16_6_a1,
     author = {L. V. H\"ormander},
     title = {On the singularities of solutions of partial differential equations},
     journal = {Matematika},
     pages = {33--59},
     publisher = {mathdoc},
     volume = {16},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1972_16_6_a1/}
}