@article{MS2_1963__13_165856,
     author = {Hans-Otto Kreiss},
     title = {\"Uber sachgem\"a{\ss}e {Cauchyprobleme.}},
     journal = {Mathematica Scandinavica},
     pages = {109--128},
     publisher = {mathdoc},
     volume = {13},
     year = {1963},
     zbl = {0145.13303},
     url = {http://geodesic.mathdoc.fr/item/MS2_1963__13_165856/}
}