@article{NAM_1887_3_6__321_1,
     author = {Drouet},
     title = {Sur les foyers des sections planes d'une quadrique},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {321--325},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {3e s{\'e}rie, 6},
     year = {1887},
     language = {fr},
     url = {http://archive.numdam.org/item/NAM_1887_3_6__321_1/}
}