no. 3
The Picard group and subintegrality in positive characteristic
Compositio Mathematica, Tome 95 (1995) no. 3, pp. 309-321. 
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     volume = {95},
     number = {3},
     year = {1995},
     mrnumber = {1318090},
     zbl = {0858.13001},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1995__95_3_309_0/}
}
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Singh, Balwant. The Picard group and subintegrality in positive characteristic. Compositio Mathematica, Tome 95 (1995) no. 3, pp. 309-321. http://archive.numdam.org/item/CM_1995__95_3_309_0/

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