@article{1077293729,
author = {Levitt, Gilbert},
title = {Constructing free actions on $\mathbf{R}$ -trees},
journal = {Duke Math. J.},
volume = {72},
number = {1},
year = {1993},
pages = { 615-633},
language = {en},
url = {http://dml.mathdoc.fr/item/1077293729}
}
Levitt, Gilbert. Constructing free actions on $\mathbf{R}$ -trees. Duke Math. J., Tome 72 (1993) no. 1, pp. 615-633. http://gdmltest.u-ga.fr/item/1077293729/