@article{1077378641, author = {Kallman, Robert R.}, title = {A generalization of free action}, journal = {Duke Math. J.}, volume = {36}, number = {1}, year = {1969}, pages = { 781-789}, language = {en}, url = {http://dml.mathdoc.fr/item/1077378641} }
Kallman, Robert R. A generalization of free action. Duke Math. J., Tome 36 (1969) no. 1, pp. 781-789. http://gdmltest.u-ga.fr/item/1077378641/