@article{GDZPPN002347431,
title = {\"Uber sachgem\"a\ss e Cauchyprobleme.},
journal = {Mathematica Scandinavica},
volume = {13},
year = {1963},
pages = {109-128},
zbl = {0145.13303},
url = {http://dml.mathdoc.fr/item/GDZPPN002347431}
}
Kreiss, Hans-Otto. Über sachgemäße Cauchyprobleme.. Mathematica Scandinavica, Tome 13 (1963) pp. 109-128. http://gdmltest.u-ga.fr/item/GDZPPN002347431/