Didier Dubois Siegfried Gottwald Petr Hájek Janusz Kacprzyk Henri Prade Terminological difficulties in fuzzy set theory - The case of "Intuitionistic Fuzzy Sets". 485-491 2005 156 Fuzzy Sets and Systems 3 http://dx.doi.org/10.1016/j.fss.2005.06.001 db/journals/fss/fss156.html#DuboisGHKP05