@article{JDM_1934__44_146032,
     author = {Hellmuth Kneser},
     title = {Verschwindende {Quadratsummen} in {K\"orpern.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {143--146},
     publisher = {mathdoc},
     volume = {44},
     year = {1934},
     zbl = {0009.39404},
     url = {http://geodesic.mathdoc.fr/item/JDM_1934__44_146032/}
}