1. D. Boucher, W. Geiselmann, and F. Ulmer, Skew-cyclic codes, Appl. Algebra Engrg. Comm. Comput. 18 (2007), no. 4, 379–389.[MR/arXiv]
  2. Delphine Boucher, Philippe Gaillard, and Felix Ulmer, Fourth order linear differential equations with imprimitive group, in ISSAC '03: Proceedings of the 2003 International Symposium on Symbolic and Algebraic Computation, ACM, New York, 2003, pp. 45–49 (electronic).[MR]
  3. Delphine Boucher, Patrick Solé, and Felix Ulmer, Skew constacyclic codes over Galois rings, Adv. Math. Commun. 2 (2008), no. 3, 273–292.[MR]
  4. Delphine Boucher and Felix Ulmer, Coding with skew polynomial rings, J. Symbolic Comput. 44 (2009), no. 12, 1644–1656.[MR/doi]
  5. Lionel Chaussade, Pierre Loidreau, and Felix Ulmer, Skew codes of prescribed distance or rank, Des. Codes Cryptogr. Online first (2008), 18.
  6. Olivier Cormier, Michael F. Singer, and Felix Ulmer, Computing the Galois group of a polynomial using linear differential equations, in Proceedings of the 2000 International Symposium on Symbolic and Algebraic Computation (St. Andrews), ACM, New York, 2000, pp. 78–85 (electronic).[MR]
  7. Michael F. Singer and Felix Ulmer, Galois groups of second and third order linear differential equations, J. Symbolic Comput. 16 (1993), no. 1, 9–36.[MR]
  8. Michael F. Singer and Felix Ulmer, Liouvillian and algebraic solutions of second and third order linear differential equations, J. Symbolic Comput. 16 (1993), no. 1, 37–73.[MR]
  9. Michael F. Singer and Felix Ulmer, On a third order differential equation whose differential Galois group is the simple group of 168 elements, Applied algebra, algebraic algorithms and error-correcting codes (San Juan, PR, 1993), Lecture Notes in Comput. Sci., vol. 673, Springer, Berlin, 1993, pp. 316–324.[MR]
  10. Michael F. Singer and Felix Ulmer, Necessary conditions for Liouvillian solutions of (third order) linear differential equations, Appl. Algebra Engrg. Comm. Comput. 6 (1995), no. 1, 1–22.[MR]
  11. Felix Ulmer, On algebraic solutions of linear differential equations with primitive unimodular Galois group, Applied Algebra, Algebraic Algorithms and Error-correcting Codes (New Orleans, LA, 1991), Lecture Notes in Comput. Sci., vol. 539, Springer, Berlin, 1991, pp. 446–455.[MR]
  12. Felix Ulmer, On Liouvillian solutions of linear differential equations, Appl. Algebra Engrg. Comm. Comput. 2 (1992), no. 3, 171–193.[MR]
  13. Felix Ulmer, Liouvillian solutions of third order differential equations, J. Symbolic Comput. 36 (2003), no. 6, 855–889.[MR]