About Cardinality-based Possibilistic Queries against Possibilistic Databases. - Patrick Bosc; Nadia Liétard; Olivier Pivert (EUSFLAT Conf., 2005)

About Inclusion-Based Generalized Yes/No Queries in a Possibilistic Database Context. - Patrick Bosc; Nadia Liétard; Olivier Pivert (ISMIS, 2006)

About Generalized YES/NO Queries in the Possibilistic and Probabilistic Database Contexts - Patrick Bosc; Nadia Liétard; Olivier Pivert (TDM, 2006)

About the processing of possibilistic queries involving a difference operation. - Patrick Bosc; Nadia Liétard; Olivier Pivert (Fuzzy Sets Syst., 2006)