D. Beneventano, S. Bergamaschi, and C. Sartori. FQAS, volume 62 of Datalogiske Skrifter (Writings on Computer Science), page 167-187. Roskilde University, (1996)
D. Beneventano, S. Haoum, and D. Montanari. Database and Expert Systems Applications, 2007. DEXA '07. 18th International Conference on, page 412-418. (September 2007)