Isocrystals with additional structure
Compositio Mathematica, Tome 56 (1985) no. 2, p. 201-220 
@article{CM_1985__56_2_201_0,
     author = {Kottwitz, Robert E.},
     title = {Isocrystals with additional structure},
     journal = {Compositio Mathematica},
     publisher = {Martinus Nijhoff Publishers},
     volume = {56},
     number = {2},
     year = {1985},
     pages = {201-220},
     zbl = {0597.20038},
     mrnumber = {809866},
     language = {en},
     url = {http://www.numdam.org/item/CM_1985__56_2_201_0}
}

Kottwitz, Robert E. Isocrystals with additional structure. Compositio Mathematica, Tome 56 (1985) no. 2, pp. 201-220. http://www.numdam.org/item/CM_1985__56_2_201_0/

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