Kisin
Andr´e,Yves Andr´e, Yves1 Sur la conjecture des p-courbures de Grothendieck-Katz et un probl`eme deDwork. (French. French summary) [The Grothendieck-Katz p-curvature conjecture and a problem of Dwork] Geometric aspects of Dwork theory.Vol. I, II, 55–112, Walter de Gruyter GmbH & Co.KG, Berlin, 2004.
A. Chambert-Loir [Ast´erisque No. 282 (2002), Exp. No. 886, viii, 175–209; MR1975179 (2004f:11062)].
nLab page on p-curvature conjecture