Voir la notice de l'article provenant de la source European Digital Mathematics Library
@misc{CMH_1972__47_186142, title = {[unknown]}, journal = {Commentarii mathematici Helvetici}, pages = {270--272}, publisher = {mathdoc}, volume = {47}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_186142/} }
[unknown]. Commentarii mathematici Helvetici, Tome 47 (1972), pp. 270-272. http://geodesic.mathdoc.fr/item/CMH_1972__47_186142/