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@article{MS2_1959__7_165712, author = {Lars H\"ormander}, title = {On the {Uniqueness} of the {Cauchy} {Problem} {II.}}, journal = {Mathematica Scandinavica}, pages = {177--190}, publisher = {mathdoc}, volume = {7}, year = {1959}, zbl = {0090.08001}, url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165712/} }
Lars Hörmander. On the Uniqueness of the Cauchy Problem II.. Mathematica Scandinavica, Tome 7 (1959), pp. 177-190. http://geodesic.mathdoc.fr/item/MS2_1959__7_165712/