no. 2
A note on Enriques' surfaces in characteristic 2
Compositio Mathematica, Tome 47 (1982) no. 2, pp. 207-216. 
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     title = {A note on {Enriques'} surfaces in characteristic 2},
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     number = {2},
     year = {1982},
     mrnumber = {677021},
     zbl = {0505.14027},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1982__47_2_207_0/}
}
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Katsura, Toshiyuki. A note on Enriques' surfaces in characteristic 2. Compositio Mathematica, Tome 47 (1982) no. 2, pp. 207-216. http://archive.numdam.org/item/CM_1982__47_2_207_0/

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