@article{MAT_1972_16_4_a4,
     author = {L. Nirenberg and F. Tr\`eves},
     title = {A correction to: {``On} local solvability of linear partial differential equations. {II.~Sufficient} conditions''},
     journal = {Matematika},
     pages = {149--152},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1972_16_4_a4/}
}