@incollection{MSMF_1974__39-40__27_0,
     author = {Dwork, B. M.},
     title = {On $p$-adic differential equations. {The} {Frobenius} structure of differential equations},
     booktitle = {Table ronde d'analyse non archim\'edienne (Paris, 1972)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {27--37},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {39-40},
     year = {1974},
     doi = {10.24033/msmf.161},
     mrnumber = {58 #27987a},
     zbl = {0304.14014},
     url = {http://www.numdam.org/articles/10.24033/msmf.161/}
}