Torsors and special extensions
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) no. 1, pp. 63-90. 
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     title = {Torsors and special extensions},
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     pages = {63--90},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {26},
     number = {1},
     year = {1985},
     mrnumber = {794417},
     zbl = {0578.18010},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1985__26_1_63_0/}
}
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Vale, Maria J. Torsors and special extensions. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) no. 1, pp. 63-90. http://archive.numdam.org/item/CTGDC_1985__26_1_63_0/

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