@article{1181072974, author = {Hilgert, J.}, title = {Infinitesimally Generated Subsemigroups of Motion Groups}, journal = {Rocky Mountain J. Math.}, volume = {21}, number = {4}, year = {1991}, pages = { 865-878}, language = {en}, url = {http://dml.mathdoc.fr/item/1181072974} }
Hilgert, J. Infinitesimally Generated Subsemigroups of Motion Groups. Rocky Mountain J. Math., Tome 21 (1991) no. 4, pp. 865-878. http://gdmltest.u-ga.fr/item/1181072974/