Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1970_14_3_a2, author = {D. Spencer}, title = {Overdetermined systems of linear partial differential equations}, journal = {Matematika}, pages = {99--126}, publisher = {mathdoc}, volume = {14}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1970_14_3_a2/} }
D. Spencer. Overdetermined systems of linear partial differential equations. Matematika, Tome 14 (1970) no. 3, pp. 99-126. http://geodesic.mathdoc.fr/item/MAT_1970_14_3_a2/