Implication in fuzzy logic. - Philippe Smets; Paul Magrez (Int. J. Approx. Reason., 1987)

Fuzzy Quanlitative Modeling. - Jean-Pierre Nordvik; Philippe Smets; Paul Magrez (IPMU, 1988)

Epistemic necessity, possibility, and truth. Tools for dealing with imprecision and uncertainty in fuzzy knowledge-based systems. - Paul Magrez; Philippe Smets (Int. J. Approx. Reason., 1989)

Fuzzy modus ponens: A new model suitable for applications in knowledge-based systems. - Paul Magrez; Philippe Smets (Int. J. Intell. Syst., 1989)