Operations Preserving Recognizable Languages. - Jean Berstel; Luc Boasson; Olivier Carton; Bruno Petazzoni; Jean-Eric Pin (FCT, 2003)

Operations preserving regular languages. - Jean Berstel; Luc Boasson; Olivier Carton; Bruno Petazzoni; Jean-Eric Pin (Theor. Comput. Sci., 2006)