1. Introduction to Commutative Algebra;Atiyah,1969
2. The kernel of a derivation;Derksen,1991
3. Linear Algebraic Groups;Humphreys,1987
4. Differentially simple rings with no invertible derivatives;Jordan;Quart. J. Math. Oxford,1981
5. Equations de Pfaff Algébriques;Jouanolou,1979