Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1948__21_138942, author = {Hubert Cremer}, title = {Dreikreisesatz und {Zentrumproblem.}}, journal = {Commentarii mathematici Helvetici}, pages = {185--188}, publisher = {mathdoc}, volume = {21}, year = {1948}, language = {de}, url = {http://geodesic.mathdoc.fr/item/CMH_1948__21_138942/} }
Hubert Cremer. Dreikreisesatz und Zentrumproblem.. Commentarii mathematici Helvetici, Tome 21 (1948), pp. 185-188. http://geodesic.mathdoc.fr/item/CMH_1948__21_138942/