Etale p-covers in characteristic p
Compositio Mathematica, Tome 52 (1984) no. 1, pp. 31-45. 
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     author = {Crew, Richard M.},
     title = {Etale $p$-covers in characteristic $p$},
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     volume = {52},
     number = {1},
     year = {1984},
     mrnumber = {742696},
     zbl = {0558.14009},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1984__52_1_31_0/}
}
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Crew, Richard M. Etale $p$-covers in characteristic $p$. Compositio Mathematica, Tome 52 (1984) no. 1, pp. 31-45. http://archive.numdam.org/item/CM_1984__52_1_31_0/

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