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@article{IM2_1973_7_2_a5, author = {M. L. Gromov}, title = {Convex integration of differential {relations.~I}}, journal = {Izvestiya. Mathematics }, pages = {329--343}, publisher = {mathdoc}, volume = {7}, number = {2}, year = {1973}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_2_a5/} }
M. L. Gromov. Convex integration of differential relations.~I. Izvestiya. Mathematics , Tome 7 (1973) no. 2, pp. 329-343. http://geodesic.mathdoc.fr/item/IM2_1973_7_2_a5/