Computing the Galois group of a polynomial using linear differential equations. - Olivier Cormier; Michael F. Singer; Felix Ulmer (ISSAC, 2000)

On Liouvillian solutions of linear differential equations of order 4 and 5. - Olivier Cormier (ISSAC, 2001)

Linear Differential Operators for Polynomial Equations. - Olivier Cormier; Michael F. Singer; Barry M. Trager; Felix Ulmer (J. Symb. Comput., 2002)