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@article{CM_1984__52_1_31_0, author = {Crew, Richard M.}, title = {Etale $p$-covers in characteristic $p$}, journal = {Compositio Mathematica}, pages = {31--45}, publisher = {Martinus Nijhoff Publishers}, volume = {52}, number = {1}, year = {1984}, mrnumber = {742696}, zbl = {0558.14009}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1984__52_1_31_0/} }
Crew, Richard M. Etale $p$-covers in characteristic $p$. Compositio Mathematica, Tome 52 (1984) no. 1, pp. 31-45. http://geodesic.mathdoc.fr/item/CM_1984__52_1_31_0/