@article{JRAM_1924__153_149531,
     author = {Helmut Hasse},
     title = {Symmetrische {Matrizen} im {K\"orper} der rationalen {Zahlen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {12--43},
     publisher = {mathdoc},
     volume = {153},
     year = {1924},
     zbl = {49.0104.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1924__153_149531/}
}