| Volume 20, Supplement 1 | |
| Editorial | |
| An Unusual Commemoration for an Unusual Man, Professor Krassimir Atanassov | |
| Invited Papers | |
| Intuitionistic Fuzzy Sets | S1-S6 |
| Krassimir Atanassov [ full text ] | |
| Review and New Results on Intuitionistic Fuzzy Sets | S7-S16 |
| Krassimir Atanassov [ full text ] | |
| Two Variants of Intuitionistic Fuzzy Propositional Calculus | S17-S26 |
| Krassimir Atanassov [ full text ] | |
| Geometrical Interpretation of the Elements of the Intuitionistic Fuzzy Objects | S27-S42 |
| Krassimir Atanassov [ full text ] | |
| Two Variants of Intuitionistic Fuzzy Modal Logics | S43-S54 |
| Krassimir Atanassov [ full text ] | |
| Four New Operators over Intuitionistic Fuzzy Sets | S55-S62 |
| Krassimir Atanassov [ full text ] | |
| Remarks on a Temporal Intuitionistic Fuzzy Logic | S63-S68 |
| Krassimir Atanassov [ full text ] | |
| Intuitionistic Fuzzy Sets over Different Universes | S69-S74 |
| Krassimir Atanassov [ full text ] | |
| One New Algebraic Object | S75-S83 |
| Krassimir Atanassov [ full text ] | |
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