@article{NAM_1850_1_9__247_1,
     author = {Martorey},
     title = {Lieu g\'eom\'etrique relatif aux foyers des coniques},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {247--252},
     publisher = {Bachelier},
     volume = {1e s{\'e}rie, 9},
     year = {1850},
     language = {fr},
     url = {http://archive.numdam.org/item/NAM_1850_1_9__247_1/}
}