Flat vector bundles and the fundamental group in non-zero characteristics
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 1, pp. 1-31. 
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Gieseker, D. Flat vector bundles and the fundamental group in non-zero characteristics. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 1, pp. 1-31. http://archive.numdam.org/item/ASNSP_1975_4_2_1_1_0/

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