@article{JMPA_1866_2_11__280_0,
     author = {Liouville, J.},
     title = {Sur les deux formes $2x^2+3y^2+4z^2+4zt+4t^2$, $x^2+2y^2+6z^2+6t^2$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {280--282},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 11},
     year = {1866},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1866_2_11__280_0/}
}