- A
few pages from "Intro to Commutative ..." by Kunz

- "Initial Results in the
theory of
linear algebraic groups" by Rosenlicht

- "Notes on difference
equations" by
Singer (the prequil to "Galois Theory of Difference
Equations")

- "Solving difference equations in finite terms" by Hendriks and Singer
- "An Algorithm for determining the difference Galois group of second order difference equations""by Hendriks
- "Quantum Automata and Algebraic Groups" by Derksen et al
- "Hypergeometric solutions
of
linear recurrences with polynomial coefficients"by Petkovsek

and here are the lecture notes for the course.