1. “An introduction to differential algebra”;Kaplansky,1976
2. “Differential algebra and algebraic groups”;Kolchin,1973
3. “Lectures on differential Galois theory”;Magid,1994
4. “Galois theory of linear differential equations”;van der Put,2003
5. Picard-Vessiot theory of partial differential fields;Kolchin;Proc. Amer. Math. Soc.,1952