@article{JMPA_1864_2_9__123_0,
     author = {Liouville, J.},
     title = {Sur la forme $x^2+y^2+2z^2+2zt+2t^2+3u^2+3\nu^2$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {123--128},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 9},
     year = {1864},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1864_2_9__123_0/}
}