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@article{CMH_1983__58_139931, author = {Jacques Th\'evenaz}, title = {Lifting idempotents and {Clifford} theory.}, journal = {Commentarii mathematici Helvetici}, pages = {86--95}, publisher = {mathdoc}, volume = {58}, year = {1983}, zbl = {0518.20005}, url = {http://geodesic.mathdoc.fr/item/CMH_1983__58_139931/} }
Jacques Thévenaz. Lifting idempotents and Clifford theory.. Commentarii mathematici Helvetici, Tome 58 (1983), pp. 86-95. http://geodesic.mathdoc.fr/item/CMH_1983__58_139931/