@article{NAM_1878_2_17__446_1,
     author = {Lucas, \'Edouard},
     title = {Sur le syst\`eme des \'equations ind\'etermin\'ees $x^2-Ay^2=u^2,~x^2+Ay^2=v^2$},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {446--453},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 17},
     year = {1878},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1878_2_17__446_1/}
}