@article{ASENS_1992_4_25_4_429_0,
     author = {Crew, Richard},
     title = {$F$-isocrystals and their monodromy groups},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {429--464},
     publisher = {Elsevier},
     volume = {Ser. 4, 25},
     number = {4},
     year = {1992},
     doi = {10.24033/asens.1655},
     mrnumber = {94a:14021},
     zbl = {0783.14008},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1655/}
}