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[1] Atanassov K., Two variants of intuitionistic fuzzy propositional calculus. Preprint IMMFAIS-5-88, Sofia, 1988.
[2] Atanassov, K. Intuitionistic Fuzzy Sets. Springer Physica-Verlag, Heidelberg, 1999.
[3] Atanassov, K. Intuitionistic fuzzy implications and Modus Ponens. Notes on Intuitionistic Fuzzy Sets, Vol. 11, 2005, No. 1, 1-5.
[4] Atanassov, K. A new intuitionistic fuzzy implication from a modal type. Advanced Studies in Contemporary Mathematics, Vol. 12, 2006, No. 1 (in press).
[5] Atanassov, K. On some intuitionistic fuzzy implications. Comptes Rendus de l'Academie bulgare des Sciences, Tome 59, 2006 , No. 1 (in press).
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[7] Atanassov, K., Boyan Kolev, On an intuitionistic fuzzy implication from a possibilistic type. Advanced Studies in Contemporary Mathematics, Vol. 12, 2006, No. 1 (in press).
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