@article{MS2_1959__7_165704,
     author = {Hans-Otto Kreiss},
     title = {\"Uber {Matrizen} die beschr\"ankte {Halbgruppen} erzeugen.},
     journal = {Mathematica Scandinavica},
     pages = {71--80},
     publisher = {mathdoc},
     volume = {7},
     year = {1959},
     zbl = {0090.09801},
     url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165704/}
}