@article{MAN_1988__281_4_164444,
     author = {William E. Lang},
     title = {On {Enriques} {Surfaces} in {Characteristic} p. {II.}},
     journal = {Mathematische Annalen},
     pages = {671--686},
     publisher = {mathdoc},
     volume = {281},
     number = {4},
     year = {1988},
     zbl = {0708.14026},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__281_4_164444/}
}