@article{GDZPPN002053896, title = {\"Uber monothetische Gruppen.}, journal = {Commentarii mathematici Helvetici}, volume = {16}, year = {1943}, pages = {249-263}, zbl = {0061.04402}, url = {http://dml.mathdoc.fr/item/GDZPPN002053896} }
Eckmann, Beno. Über monothetische Gruppen.. Commentarii mathematici Helvetici, Tome 16 (1943) pp. 249-263. http://gdmltest.u-ga.fr/item/GDZPPN002053896/