A note on the base change map for cohomology
Compositio Mathematica, Tome 27 (1973) no. 1, pp. 25-38. 
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     title = {A note on the base change map for cohomology},
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     url = {http://archive.numdam.org/item/CM_1973__27_1_25_0/}
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Altman, Allen B.; Hoobler, Raymond T.; Kleiman, Steven L. A note on the base change map for cohomology. Compositio Mathematica, Tome 27 (1973) no. 1, pp. 25-38. http://archive.numdam.org/item/CM_1973__27_1_25_0/

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