@article{CRMATH_2007__344_7_413_0,
     author = {Ji, Chun-Gang and Wei, Da-Sheng},
     title = {Sums of integral squares in cyclotomic fields},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {413--416},
     publisher = {Elsevier},
     volume = {344},
     number = {7},
     year = {2007},
     doi = {10.1016/j.crma.2007.02.003},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.02.003/}
}