@article{NAM_1859_1_18__174_1,
     author = {Dewulf},
     title = {D\'emonstration de deux th\'eor\`emes de {M.} {Steiner}},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {174--180},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {1e s{\'e}rie, 18},
     year = {1859},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1859_1_18__174_1/}
}