Berthelot, P. “Preface.” Notes on Crystalline Cohomology. (MN-21), by Pierre Berthelot and Arthur Ogus, Princeton University Press, Princeton, New Jersey, 1978, pp. i-vi, www.jstor.org/stable/j.ctt130hk6f.3. Accessed 25 July 2021.
Berthelot, P. (1978). Preface. In Berthelot P. & Ogus A. (Authors), Notes on Crystalline Cohomology. (MN-21) (pp. I-Vi). Princeton, New Jersey: Princeton University Press. Retrieved July 25, 2021, from http://www.jstor.org/stable/j.ctt130hk6f.3
Berthelot, P. "Preface." In Notes on Crystalline Cohomology. (MN-21), by Berthelot Pierre and Ogus Arthur, I-Vi. Princeton, New Jersey: Princeton University Press, 1978. Accessed July 25, 2021. http://www.jstor.org/stable/j.ctt130hk6f.3.
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