@conference{Lang91,
author = "J{\'e}r{\^o}me Lang",
booktitle = "FAIR'91",
keywords = "logique propositionnelle, preferences, flou,
                   contraintes, optimisation, satisfaction partielle",
title = "{P}ossibilistic {L}ogic as a {L}ogical {F}ramework for {M}in-{M}ax
                   {D}iscrete {O}ptimisation {P}roblems and {P}rioritized
                   {C}onstraints",
year = "1991",
}