@article{NAM_1894_3_13__97_1,
     author = {Tissot, A.},
     title = {Formules relatives aux foyers des coniques},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {97--98},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {3e s{\'e}rie, 13},
     year = {1894},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1894_3_13__97_1/}
}