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@article{JRAM_1991__417_153329, author = {Alan Weinstein and Ping Xu}, title = {Extensions of symplectic groupoids and quantization.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {159--190}, publisher = {mathdoc}, volume = {417}, year = {1991}, zbl = {0722.58021}, url = {http://geodesic.mathdoc.fr/item/JRAM_1991__417_153329/} }
Alan Weinstein; Ping Xu. Extensions of symplectic groupoids and quantization.. Journal für die reine und angewandte Mathematik, Tome 417 (1991), pp. 159-190. http://geodesic.mathdoc.fr/item/JRAM_1991__417_153329/