@article{CMH_1939__12_138753,
     author = {W. Habicht},
     title = {\"Uber die {Zerlegung} strikte definiter {Formen} in {Quadrate.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {317--322},
     publisher = {mathdoc},
     volume = {12},
     year = {1939},
     zbl = {66.0051.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1939__12_138753/}
}