@article{NAM_1918_4_18__23_1,
     author = {Juhel-R\'enoy, J.},
     title = {Sur les foyers des courbes planes},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {23--25},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {4e s{\'e}rie, 18},
     year = {1918},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1918_4_18__23_1/}
}