@article{NAM_1915_4_15__106_0,
     author = {Laisant, C.-A.},
     title = {Sur le syst\`eme d{\textquoteright}\'equations ind\'etermin\'ees $x^2+y=z^2$, $x+y^2=t^2$},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {106--108},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {4e s{\'e}rie, 15},
     year = {1915},
     language = {fr},
     url = {http://archive.numdam.org/item/NAM_1915_4_15__106_0/}
}