@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/