Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1955__29_139110, author = {Walter Nohl}, title = {Kosmologische {L\"osungen} eines homogenen {Wirkungsprinzips.}}, journal = {Commentarii mathematici Helvetici}, pages = {338--350}, publisher = {mathdoc}, volume = {29}, year = {1955}, zbl = {0065.21102}, url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139110/} }
Walter Nohl. Kosmologische Lösungen eines homogenen Wirkungsprinzips.. Commentarii mathematici Helvetici, Tome 29 (1955), pp. 338-350. http://geodesic.mathdoc.fr/item/CMH_1955__29_139110/