@article{701454,
     title = {The enveloping group of a lie algebra},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[355]-367},
     mrnumber = {MR1009586},
     zbl = {0684.22010},
     url = {http://dml.mathdoc.fr/item/701454}
}

Wojtyński, Wojciech. The enveloping group of a lie algebra, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), pp. [355]-367. http://gdmltest.u-ga.fr/item/701454/