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Bipolar Fuzzy Sets Are Intuitionistic Fuzzy Sets

Proceedings of the Bulgarian Academy of Sciences
In 1983 the Intuitionistic Fuzzy Sets (IFSs) were introduced as an extension of Zadeh's fuzzy sets. Fifteen years later the Bipolar Fuzzy Sets (BFSs) were introduced as a new extension of fuzzy sets. In the article it is proved that each BFS can be transformed injectively or bijectively to an IFSs.
Krassimir Atanassov, Janusz Kacprzyk
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Generalized intuitionistic fuzzy rough sets based on intuitionistic fuzzy coverings

Information Sciences, 2012
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A correlation coefficient for intuitionistic fuzzy sets

International Journal of Intelligent Systems, 2004
Summary: Intuitionistic fuzzy sets are a generalization of the ordinary fuzzy sets in which we have both a membership function \(\mu\) and a nonmembership function \(\nu\). In this article we consider the problem of defining a correlation coefficient between two intuitionistic fuzzy sets.
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Intuitionistic Fuzzy Sets as a Generalization of Fuzzy Sets

2014
In the mid-1980s Atanassov introduced the concept of an intuitionistic fuzzy set. Basically, his idea was that unlike the conventional fuzzy sets in which imprecision is just modeled by the membership degree from [0,1], and for which the non-membership degree is just automatically the complementation to 1 of the membership degree, in an intuitionistic ...
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Intuitionistic fuzzy sets or orthopair fuzzy sets? [PDF]