no. 3
Unirationality of Enriques surfaces in characteristic two
Compositio Mathematica, Tome 45 (1982) no. 3, pp. 393-398. 
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     title = {Unirationality of {Enriques} surfaces in characteristic two},
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     volume = {45},
     number = {3},
     year = {1982},
     mrnumber = {656613},
     zbl = {0549.14019},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1982__45_3_393_0/}
}
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Blass, Piotr. Unirationality of Enriques surfaces in characteristic two. Compositio Mathematica, Tome 45 (1982) no. 3, pp. 393-398. http://archive.numdam.org/item/CM_1982__45_3_393_0/

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