%0 Journal Article %A Spring, David %T Convex integration of non-linear systems of partial differential equations %J Annales de l'Institut Fourier %D 1983 %P 121-177 %V 33 %N 3 %I Institut Fourier %C Grenoble %U http://archive.numdam.org/articles/10.5802/aif.934/ %R 10.5802/aif.934 %G en %F AIF_1983__33_3_121_0