@article{CMH_1987__62_140104,
     author = {Stephen Halperin},
     title = {The non-vanishing of the deviations of a local ring.},
     journal = {Commentarii mathematici Helvetici},
     pages = {646--653},
     year = {1987},
     volume = {62},
     zbl = {0639.13011},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140104/}
}