@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://archive.numdam.org/item/CM_1984__52_1_31_0/}
}