@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/}
}