References:
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- K. Atanassov, Intuitionistic fuzzy sets, in: V. Sgurev, Bd., VII ITKR's Session, Sofia, June 1983 (Central Sci. and Techn. Library, Bulg. Academy of Sciences, 1984).
- K. Atanassov and S. Stoeva, Intuitionistic fuzzy sets, in: Polish Symp. on Interval & Fuzzy Mathematics, Poznan (Aug. 1983) 23-26.
- K. Atanassov and S. Stoeva, Intuitionstic L-fuzzy sets, in: R. Trappl, Bd., Cybernetics and Systems Research 2 (Elsevier Sci. Publ., Amsterdam, 1984) 539-540.
- K. Atanassov, Intuitionistic fuzzy relations, in: L. Antonov, Bd., III International School "Automation and Scientific Instrumentation", Varna (Oct. 1984) 56-57.
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