1. Trace languages defined by recognizable string languages;Aalbersberg;RAIRO—Inform. Théor. Appl.,1986
2. Transductions and Context-Free Languages;Berstel,1979
3. Unambiguous regular trace languages;Bertoni,1985
4. Problèmes combinatoires de commutation et réarrangements;Cartier,1969
5. Semi-commutations;Clerbout;Inform. and Comput.,1987