@article{CM_1985__56_2_201_0,
     author = {Kottwitz, Robert E.},
     title = {Isocrystals with additional structure},
     journal = {Compositio Mathematica},
     pages = {201--220},
     publisher = {Martinus Nijhoff Publishers},
     volume = {56},
     number = {2},
     year = {1985},
     mrnumber = {809866},
     zbl = {0597.20038},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1985__56_2_201_0/}
}