@article{NAM_1847_1_6__253_0,
     author = {Catalan, E.},
     title = {Note sur les sph\`eres tangentes \`a quatre plans donn\'es},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {253--260},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {1e s{\'e}rie, 6},
     year = {1847},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1847_1_6__253_0/}
}