@article{1077476577, author = {Gottschalk, W. H. and Hedlund, G. A.}, title = {Asymptotic relations in topological groups}, journal = {Duke Math. J.}, volume = {18}, number = {1}, year = {1951}, pages = { 481-485}, language = {en}, url = {http://dml.mathdoc.fr/item/1077476577} }
Gottschalk, W. H.; Hedlund, G. A. Asymptotic relations in topological groups. Duke Math. J., Tome 18 (1951) no. 1, pp. 481-485. http://gdmltest.u-ga.fr/item/1077476577/