@TechReport{vdH:galois:pre,
  author = 	 {J. van der Hoeven},
  title = 	 {Around the numeric-symbolic computation of
                  differential {Galois} groups},
  institution =  {Universit\'e Paris-Sud, Orsay, France},
  number = 	 {2005-4},
  year = 	 {2005},
  note = 	 {Appeared in JSC}
}

@Article{vdH:galois,
  author = 	 {J. van der Hoeven},
  title = 	 {Around the numeric-symbolic computation of
                  differential {Galois} groups},
  journal = 	 {JSC},
  year = 	 {2007},
  volume = 	 {42},
  pages = 	 {236--264}
}