On ranking 1-way finitely ambiguous NL languages and # P 1 -complete census functions A. Bertoni; M. Goldwurm — 1993 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
On the inclusion problem for finitely ambiguous rational trace languages A. Bertoni; P. Massazza — 1998 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications