@article{ASENS_1957_3_74_3_197_0,
     author = {Lagrange, Ren\'e},
     title = {Sur le groupe ponctuel conservant la famille des coniques du plan qui ont un \'el\'ement de contact donn\'e},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {197--229},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 74},
     number = {3},
     year = {1957},
     doi = {10.24033/asens.1056},
     mrnumber = {21 #837},
     zbl = {0079.36701},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.1056/}
}