@article{NAM_1899_3_18__293_0,
     author = {Lacour, E.},
     title = {Sur l{\textquoteright}\'equation {d{\textquoteright}Euler} : $\frac{dx}{\sqrt{\Psi (x)}}=\frac{dx_1}{\sqrt{\Psi (x_1)}}$},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {293--300},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {3e s{\'e}rie, 18},
     year = {1899},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1899_3_18__293_0/}
}