@article{02146813, title = {Non-Hausdorff groupoids, proper actions and }, journal = {Documenta Mathematica}, volume = {9}, year = {2004}, pages = {565-597}, zbl = {1058.22005}, language = {en}, url = {http://dml.mathdoc.fr/item/02146813} }
Tu, Jean-Louis. Non-Hausdorff groupoids, proper actions and . Documenta Mathematica, Tome 9 (2004) pp. 565-597. http://gdmltest.u-ga.fr/item/02146813/