1. Différentielles non commutatives et théorie de Galois différentielle ou aux différences;['André, Y.'];Annales Scientifiques de l’École Normale Supérieure. Quatrième Série,2001
2. Reduced forms of linear differential systems and the intrinsic Galois-Lie algebra of Katz;['Barkatou, M.', 'Cluzeau, T.', 'Di Vizio, L.', 'Weil, J.-A.'],2019
3. Galois Theory of Parameterized Differential Equations and Linear Differential Algebraic Groups;['Cassidy, P.J.', 'Singer, M.\xa0F.'];Differential Equations and Quantum Groups,2006
4. On the Definitions of Difference Galois Groups;['Chatzidakis, Z.', 'Hardouin, C.', 'Singer, M.\xa0F.'];Model Theory with applications to algebra and analysis, I and II,2008
5. [5] Cohn, R. M. Difference algebra, Interscience Publishers John Wiley & Sons, New York-London-Sydney, 1965, xiv+355 pages