Notes on Intuitionistic Fuzzy Sets


Print ISSN	1310-4926
Online ISSN	2367-8283
DOI	10.7546/nifs
SJR (2024)	0.258
Scopus Quartile	Q3

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.

Scope

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 http://biomed.bas.bg/bg/journals/). 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. For acceptance for publication, two positive single blind peer reviews are required by independent reviewers. Strict ethical publication policy applies to all journal editors, reviewers and authors.

Papers will only be considered if the content is substantially new, original material which has not been published elsewhere, has not been submitted concurrently elsewhere, nor is likely to be published substantially in the same form elsewhere. NNTDM reserves the right to conduct a preliminary screening (triage) of the manuscripts and desk reject without further peer review any submissions that are out of the thematic scope of the Journal, not formatted in accordance with the Journal’s templates and requirements, or feature content below the level of a scientific journal.

Authors are welcome to suggest two or three names of potential reviewers with their Scopus profiles and email addresses. Please note that these potential reviewers shall not share the same affiliation and country of residence with any of the coauthors of the submitted manuscript. Further, a Scopus h-index of at least 5 is required. However, NNTDM reserves the right to invite for reviewers other specialists than those proposed.

Indexing

As of June 2025, "Notes on Intuitionistic Fuzzy Sets" has been assigned SJR = 0.258 and Scopus quartile Q3. As of August 2024, "Notes on Intuitionistic Fuzzy Sets" is being indexed in Scopus (content published as of 2020).

In addition, the journal is indexed at the following databases: Elektronische Zeitschriftenbibliothek EZB (Electronic Journals Library), ISSN Portal (ex-ROAD – Directory of Open Access Scholarly Resources), OpenAlex, WorldCat / OCLC, Academic Resource Index ResearchBib, and Zentralblatt MATH (1995-2017) and has applied for indexing in several other databases.

As of its beginning in 1995, Journal copies are archived in the “St. St. Cyril and Methodius” National Library of Bulgaria.

Pricing

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.

Additionally, NNTDM offers its authors and readers the opportunity to purchase copies or make annual subscription to the printed version of the Journal. We accept bank transfers and issue invoices.

Prices (as of January 2025):

Price for a single copy of any volume/number – 60 EUR
Annual subscription (4 copies/year) – 240 EUR

Details for bank transfer:

Account holder: Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences
Holder address: 21 Acad. Georgi Bonchev Str., Sofia 1113, Bulgaria
Bank name: UniCredit Bulbank, Branch “Kaloyan”
Bank address: 7 Sveta Nedelya Sq., Sofia 1000, Bulgaria
Bank account number / IBAN: BG47 UNCR 7630 3400 0011 99
Bank SWIFT / BIC: UNCRBGSF

Please note that all bank charges are on the account of the ordering side (you). The postal charges for the delivery are on behalf of the Journal (us).

Please let us know by email (nntdm.journal@gmail.com) which issues you would like to purchase, as well as provide the necessary invoice details and postal address for delivery.

We issue invoices for every bank transfer that we receive.

For an institutional invoice, please submit the following information:

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For an individual invoice, please submit the following information:

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Please let us know if you need a preliminary proforma invoice.

For delivery, we use the services of the Bulgarian National Posts and provide links with tracking numbers for every delivery.

Impact

Scientific research published in the Journal has constantly increased its outreach to the international research community working in the area of intuitionistic fuzzy sets.

As of July 2025, NIFS has Scopus Journal Rank (SJR) for 2024 equal to 0.258, and Scopus quartile Q3.

According to data from Scopus (July 2025), more than 2000 publications, indexed in Scopus, have cited papers from Notes on Intuitionistic Fuzzy Sets, as of the beginning of the Journal's publication in 1995.

More than 170 papers from NIFS are now indexed in Scopus, which is the Journal's contents as of the beginning of 2020.

Acknowledgements

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
Grant No. KP-06-NP4-22/2022 for Volume 29, Numbers 1-4, year 2023
Grant No. KP-06-NP6-7/2024 for Volume 31, Numbers 1-4, year 2025

Contacts

For submissions and communication: nifs.journal@gmail.com with CC to k.t.atanassov@gmail.com

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