no. 1
On the p-adic continuation of the logarithmic derivative of certain hypergeometric functions
Groupe d'étude d'analyse ultramétrique, Tome 12 (1984-1985) no. 1, Exposé no. 4, 5 p. 
@article{GAU_1984-1985__12_1_A3_0,
     author = {Sperber, Steven and Sibuya, Yasutaka},
     title = {On the $p$-adic continuation of the logarithmic derivative of certain hypergeometric functions},
     journal = {Groupe d'\'etude d'analyse ultram\'etrique},
     note = {talk:4},
     pages = {1--5},
     year = {1984-1985},
     publisher = {Secr\'etariat math\'ematique},
     volume = {12},
     number = {1},
     mrnumber = {848988},
     zbl = {0589.12021},
     language = {en},
     url = {https://www.numdam.org/item/GAU_1984-1985__12_1_A3_0/}
}
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Sperber, Steven; Sibuya, Yasutaka. On the $p$-adic continuation of the logarithmic derivative of certain hypergeometric functions. Groupe d'étude d'analyse ultramétrique, Tome 12 (1984-1985) no. 1, Exposé no. 4, 5 p.. https://www.numdam.org/item/GAU_1984-1985__12_1_A3_0/

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