Geodesic
On local solvability of linear partial differential equations. I.~Necessary conditions
Matematika, Tome 15 (1971) no. 3, pp. 142-172

Voir la notice de l'article provenant de la source Math-Net.Ru

@article{MAT_1971_15_3_a5,
     author = {L. Nirenberg and F. Tr\`eves},
     title = {On local solvability of linear partial differential equations. {I.~Necessary} conditions},
     journal = {Matematika},
     pages = {142--172},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1971_15_3_a5/}
}
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L. Nirenberg; F. Trèves. On local solvability of linear partial differential equations. I.~Necessary conditions. Matematika, Tome 15 (1971) no. 3, pp. 142-172. http://geodesic.mathdoc.fr/item/MAT_1971_15_3_a5/