Assuming that you need to assume. - Jean-Marc Pugin (SPLT, 1986)

Using integrity constraints to control hypotheses formation. - Jean-Marc Pugin (SPLT, 1987)

Maintenance of Stratified Databases Viewed as a Belief Revision System. - Krzysztof R. Apt; Jean-Marc Pugin (PODS, 1987)

Efficient Query Answering on Stratified Databases. - Jean-Marc Kerisit; Jean-Marc Pugin (FGCS, 1988)