By Marichal J-L.   Mathonet P.   in Journal of Mathematical Psychology

ISSN:0022-2496|45|2|213-223

Academic Press‎(2001)‎

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By Marichal J.-L.   Mathonet P.   Tousset E.   in Fuzzy Sets and Systems

ISSN:0165-0114|102|2|293-314

Elsevier‎(1999)‎

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