@article{CTGDC_1985__26_1_63_0, author = {Vale, Maria J.}, title = {Torsors and special extensions}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {26}, year = {1985}, pages = {63-90}, mrnumber = {794417}, zbl = {0578.18010}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1985__26_1_63_0} }
Vale, Maria J. Torsors and special extensions. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) pp. 63-90. http://gdmltest.u-ga.fr/item/CTGDC_1985__26_1_63_0/
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