@article{10_4064_aa_24_4_379_383,
     author = {Trygve Nagell},
     title = {Sur la repr\'esentation de z\'ero par une somme de carr\'es dans un corps alg\'ebrique},
     journal = {Acta Arithmetica},
     pages = {379--383},
     publisher = {mathdoc},
     volume = {24},
     number = {4},
     year = {1973},
     doi = {10.4064/aa-24-4-379-383},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-24-4-379-383/}
}