no. 2
The non rationality of the generic Enriques' threefold
Compositio Mathematica, Tome 48 (1983) no. 2, pp. 167-184. 
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Botta, Luciana Picco; Verra, Alessandro. The non rationality of the generic Enriques' threefold. Compositio Mathematica, Tome 48 (1983) no. 2, pp. 167-184. http://www.numdam.org/item/CM_1983__48_2_167_0/

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