@article{BSMF_1982__110__203_0,
     author = {Katz, Nicholas M.},
     title = {A conjecture in the arithmetic theory of differential equations},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {203--239},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {110},
     year = {1982},
     doi = {10.24033/bsmf.1960},
     mrnumber = {84h:14014a},
     zbl = {0504.12022},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1960/}
}