@article{10_1090_S0894_0347_99_00273_8,
     author = {Faltings, Gerd},
     title = {Integral crystalline cohomology over very ramified valuation rings},
     journal = {Journal of the American Mathematical Society},
     pages = {117--144},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1999},
     doi = {10.1090/S0894-0347-99-00273-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-99-00273-8/}
}