@article{JRAM_1934__171_149879,
     author = {Ernst Witt},
     title = {Zerlegung reeller algebraischer {Funktionen} in {Quadrate.} {Schiefk\"orper} \"uber reellem {Funktionenk\"orper.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {4--11},
     publisher = {mathdoc},
     volume = {171},
     year = {1934},
     zbl = {0009.29103},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1934__171_149879/}
}