@article{NAM_1880_2_19__456_0,
     author = {Lionnet},
     title = {Note relative aux intersections int\'erieures des diagonales d'un polygone convexe},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {456--457},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 19},
     year = {1880},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1880_2_19__456_0/}
}