A Representation Theorem for Preferential Logics. - Pierre Siegel; Lionel Forget (KR, 1996)

Comparing a Pair-Wise Compatibility Heuristic and Relaxed Stratification: Some Preliminary Results. - Robert E. Mercer; Lionel Forget; Vincent Risch (ECSQARU, 2001)

Preferential Logics are X-logics. - Lionel Forget; Vincent Risch; Pierre Siegel (J. Log. Comput., 2001)