@PhdThesis{,
  author = 	 {Fr{\'e}d{\'e}ric Chyzak},
  title = 	 {Fonctions holonomes en calcul formel},
  school = 	 {{\'E}cole polytechnique},
  year = 	 1998,
  type = 	 {Th{\`e}se universitaire},
  note =	 {INRIA, TU~0531.  227~pages.}
}