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@article{MS2_1964__15_165898, author = {Jan Persson}, title = {A {Note} on {Formal} and {Analytic} {Cauchy} {Problems} for {Systems} with {Constant} {Coefficients.}}, journal = {Mathematica Scandinavica}, pages = {142--146}, publisher = {mathdoc}, volume = {15}, year = {1964}, zbl = {0158.10904}, url = {http://geodesic.mathdoc.fr/item/MS2_1964__15_165898/} }
Jan Persson. A Note on Formal and Analytic Cauchy Problems for Systems with Constant Coefficients.. Mathematica Scandinavica, Tome 15 (1964), pp. 142-146. http://geodesic.mathdoc.fr/item/MS2_1964__15_165898/