@article{NAM_1846_1_5__611_1,
     author = {Delacour and Mayer D'almbert},
     title = {Note sur les plans tangents aux surfaces du second degr\'e},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {611--617},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {1e s{\'e}rie, 5},
     year = {1846},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1846_1_5__611_1/}
}