Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{JRAM_1965__220_150709, author = {Charles W. Curtis}, title = {Central extensions of groups of {Lie} type.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {174--185}, publisher = {mathdoc}, volume = {220}, year = {1965}, zbl = {0137.25701}, url = {http://geodesic.mathdoc.fr/item/JRAM_1965__220_150709/} }
Charles W. Curtis. Central extensions of groups of Lie type.. Journal für die reine und angewandte Mathematik, Tome 220 (1965), pp. 174-185. http://geodesic.mathdoc.fr/item/JRAM_1965__220_150709/