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Notes on Intuitionistic Fuzzy Sets

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Print ISSN 1310-4926
Online ISSN 2367-8283
DOI 10.7546/nifs

Notes on Intuitionistic Fuzzy Sets is an international scientific journal, specialized in the theory and application of intuitionistic fuzzy sets and logics as an interdisciplinary field at the cross point between mathematics and engineering sciences.


Having started in 1995, Notes on Intuitionistic Fuzzy Sets is the first and one of the leading scientific journals, exclusively publishing research in this field of science, as defined by the strict journal's scope and Editorial policy. Created in 1983 in Bulgaria by Prof. Krassimir Atanassov, the area of intuitionistic fuzzy sets has gained worldwide popularity and today it is being investigated by many international research groups from universities and research centres in Australia, Belgium, China, Greece, India, Morocco, Poland, Portugal, Romania, Slovakia, Spain, Turkey, United Kingdom, and other countries.

The journal is one of the three official issues of the Institute of Biophysics and Biomedical Engineering of the Bulgarian Academy of Sciences (see It is published by the "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences under Print ISSN 1310-4926, e-ISSN 2367-8283 and DOI 10.7546/nifs (as of 2018).

Since 1997, the Journal has been hosting the proceedings of the International Conference on Intuitionistic Fuzzy Sets, organized on annual basis in Sofia or Burgas, Bulgaria. Since 2005, it has also included the proceedings of the International Workshop on Intuitionistic Fuzzy Sets, annually conducted in Banská Bystrica, Slovakia.

Review process

All papers and conference reports in Notes on Intuitionistic Fuzzy Sets pass through a rigorous process of review before being accepted for publication. The editorial board of the journal is international with representatives from Australia, Belgium, Bulgaria, France, Germany, India, Mexico, Poland, Romania, Slovakia, Turkey, United Kingdom, USA, who are renowned specialists in the area of fuzzy and intuitionistic fuzzy sets and logics. Two positive blind peer reviews are required by three independent reviewers. Strict ethical publication policy applies to all journal editors, reviewers and authors.


The journal is indexed at the following databases: Directory of Research Journals Indexing, Elektronische Zeitschriftenbibliothek EZB (Electronic Journals Library), Index Copernicus, ROAD – Directory of Open Access Scholarly Resources (since 2015), WorldCat / OCLC, Academic Resource Index ResearchBib, and Zentralblatt MATH (1995-2017) and it has applied for indexing in several other databases.


International Journal “Notes on Intuitionistic Fuzzy Sets” is a non-commercial all-volunteer journal.

We do NOT charge authors with article publication charges.

We do NOT charge readers with access fees.

✓ In electronic version, the full NIFS contents is available free-of-charge through the Journal website.


Scientific research published in the Journal has constantly increased its outreach to the international research community working in the area of intuitionistic fuzzy sets. According to data from SCOPUS (Jan 2022), more than 1100 publications, indexed in the SCOPUS database, have cited papers from Notes on Intuitionistic Fuzzy Sets, as of the beginning of the Journal's publication in 1995.


International Journal "Notes on Intuitionistic Fuzzy Sets" is supported by the National Science Fund of Bulgaria:

  • Grant No. DNP-05-37/2016 for Volume 23, Numbers 1-4, year 2017
  • Grant No. DNP-06-08/2017 for Volume 24, Numbers 1-4, year 2018
  • Grant No. KP-06-NP-19/2018 for Volume 25, Numbers 1-4, year 2019
  • Grant No. KP-06-NP1-28/2019 for Volume 26, Numbers 1-4, year 2020
  • Grant No. KP-06-NP2-23/2020 for Volume 27, Numbers 1-4, year 2021
  • Grant No. KP-06-NP3-44/2021 for Volume 28, Numbers 1-4, year 2022

For submissions and communication: or

For postal correspondence:

  • Acad. Krassimir Atanassov
  • Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences
  • Address: 105 "Acad. Georgi Bonchev" Str., Sofia 1113, Bulgaria