@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/}
}