no. 4
On two-dimensional regular local rings and a lifting problem
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 4, pp. 787-807. 
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     title = {On two-dimensional regular local rings and a lifting problem},
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     volume = {Ser. 3, 27},
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     year = {1973},
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Valabrega, Paolo. On two-dimensional regular local rings and a lifting problem. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 4, pp. 787-807. http://archive.numdam.org/item/ASNSP_1973_3_27_4_787_0/

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