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@article{MS2_1958__6_165687, author = {Lars H\"ormander}, title = {On the {Uniqueness} of the {Cauchy} {Problem.}}, journal = {Mathematica Scandinavica}, pages = {213--225}, publisher = {mathdoc}, volume = {6}, year = {1958}, zbl = {0088.30201}, url = {http://geodesic.mathdoc.fr/item/MS2_1958__6_165687/} }
Lars Hörmander. On the Uniqueness of the Cauchy Problem.. Mathematica Scandinavica, Tome 6 (1958), pp. 213-225. http://geodesic.mathdoc.fr/item/MS2_1958__6_165687/