On Apery's differential operator
Groupe d'étude d'analyse ultramétrique, 7-8 (1979-1981), Exposé no. 25, 6 p. 
@article{GAU_1979-1981__7-8__A11_0,
     author = {Dwork, Bernard},
     title = {On {Apery's} differential operator},
     journal = {Groupe d'\'etude d'analyse ultram\'etrique},
     note = {talk:25},
     pages = {1--6},
     year = {1979-1981},
     publisher = {Secr\'etariat math\'ematique},
     volume = {7-8},
     zbl = {0493.12031},
     language = {en},
     url = {https://www.numdam.org/item/GAU_1979-1981__7-8__A11_0/}
}
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%F GAU_1979-1981__7-8__A11_0
Dwork, Bernard. On Apery's differential operator. Groupe d'étude d'analyse ultramétrique, 7-8 (1979-1981), Exposé no. 25, 6 p.. https://www.numdam.org/item/GAU_1979-1981__7-8__A11_0/