“…Several Romanian scientists started to study fuzzy theory and their applications, obtaining valuable results, the best performers in the field were Constantin Virgil Negoita 16 and Dan Ralescu 17 , who published in collaboration two books, in 1974 [76] (in Romanian), and in 1975 [77](in English). "The first published book ever, specifically devoted to fuzzy sets is the one (in French) by Kaufmann (1973), translated into English in 1975 ( [55]), closely followed by a mathematical treatise by Negoita and Ralescu (1975, [77]), based on a 1974 monograph in Romanian ( [76]).…”