@article{1077375081, author = {Horne, Jr., J. G.}, title = {The boundary of a one-parameter group in a semigroup}, journal = {Duke Math. J.}, volume = {31}, number = {1}, year = {1964}, pages = { 109-117}, language = {en}, url = {http://dml.mathdoc.fr/item/1077375081} }
Horne, Jr., J. G. The boundary of a one-parameter group in a semigroup. Duke Math. J., Tome 31 (1964) no. 1, pp. 109-117. http://gdmltest.u-ga.fr/item/1077375081/