TITLE: Texts about Dwork's work
QUESTION [6 upvotes]: I want to ask about references to papers, that probably exist, which explain the articles of Bernard Dwork starting from "The rationality of the zeta function of an algebraic variety" to "On the Boyarsky principle".

REPLY [3 votes]: You could start with the book by Dwork, Gerotto and Sullivan, "An introduction to G-functions", published by Princeton University Press in the collection Annals of math studies. It contains a full account of the rationality of the zeta function, and the beginnings of the study of p-adic differential equations.