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@article{MMO_1963_12_a3, author = {M. I. Vishik}, title = {Quasi-linear strongly elliptic systems of differential equations of divergence form}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {125--184}, publisher = {mathdoc}, volume = {12}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1963_12_a3/} }
M. I. Vishik. Quasi-linear strongly elliptic systems of differential equations of divergence form. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 12 (1963), pp. 125-184. http://geodesic.mathdoc.fr/item/MMO_1963_12_a3/