References
- Atanassov, K. (1983). Intuitionistic Fuzzy Sets. In V. Sgurev (Ed.), VII ITKR Session. Sofia: Central Sci.-Techn. Library of the Bulg. Acad. of Sciences.
- Atanassov, K. (1986). Intuitionistic fuzzy sets. Fuzzy Sets and Systems, 20(1), 87–96. DOI: 10.1016/S0165-0114(86)80034-3.
- Atanassov, K. (1987). Generalized index matrices. Comptesrendus de l’Academie Bulgare des Sciences, 11, 15‒18.
- Atanassov, K. (2010). On index matrices, Part 2: Intuitionistic fuzzy case. Proceedings of the Jangjeon Mathematical Society, 13(2), 121–126.
- Atanassov, K., Atanassova, V. & Gluhchev G. (2015). InterCriteria analysis: ideas and problems. Notes on Intuitionistic Fuzzy Sets, 21(1), 81‒88. http://ifigenia.org/wiki/issue:nifs/21/1/81-88.
- Atanassov, K., Mavrov, D. & Atanassova V. (2014). Intercriteria decision making: A new approach for multicriteria decision making, based on index matrices and intuitionistic fuzzy sets. Issues in Intuitionistic Fuzzy Sets and Generalized Nets, 11, l‒8.
- Atanassov, K., Szmidt, E. & Kacprzyk J. (2013). On intuitionistic fuzzy pairs. Notes on Intuitionistic Fuzzy Sets, 19, 1–13. DOI: 10.7546/nifs.
- Benkov, I., Varbanov, M., Venelinov, T. & Tsakovski S. (2023). Principal component analysis and the water quality index – Powerful tool for surface water quality assessment: A case study on Struma river catchment, Bulgaria. Water, 15(10), 1961. DOI: 10.3390/w15101961.
- Diadovski, I., Petrov, M. & Ilkova T. (2018). Retrospective analysis, modelling and prognosis of river ecosystems. Sofia: Avangard Prima.
- European Parliament. Council of the European Union (2000). Directive 2000/60/EC of the European Parliament and of the Council establishing a framework for Community action in the field of water policy. EEA.
- Georgieva, V., Angelova, N., Roeva, O. & Pencheva T. (2016). Intercriteria analysis of wastewater treatment quality. Ecology & Safety, 10, 365‒376. https://www.scientific-publications.net/en/article/1001117/
- Ikonomov, N., Vassilev, P. & Roeva O. (2018). ICrAData – Software for intercriteria analysis. Int. J. Bioautomation, 22(1), 1–10. DOI: 10.7546/ijba.2018.22.1.1-10.
- Ilkova, T. & Petrov M. (2015). Application of intercriteria analysis to the Mesta River pollution modelling. Notes on Intuitionistic Fuzzy Sets, 21(2), 118–125. DOI: 10.7546/nifs.
- Ilkova, T. & Petrov M. (2016). Using Intercriteria Analysis for Assessment of the Pollution Indexes of the Struma River. In K.T. Atanassov, O. Castillo, J. Kacprzyk, M. Krawczak, P. Melin, S. Sotirov, E. Sotirova, E. Szmidt, G. de Tré & S. Zadorzny (Eds.), Novel Developments in Uncertainty Representation and Processing (pp. 351‒364). Advances in Intelligent Systems and Computing 401. Cham: Springer. DOI: 10.1007/978-3-319-26211-6_30.
- Ministry of Environment and Water of Bulgaria (2006). West Aegean Water Basin Directorate (WAWBD). Blagoevgrad.
- Simeonova, P., Simeonov, V. & Andreev G. (2003). Water quality study of the Struma river basin, Bulgaria (1989–1998). Cent. Eur. J. Chem. 1, 121‒136. DOI: 10.2478/BF02479264.
- Zadeh, L. (1965). Fuzzy sets. Information and Control, 8, 333–353. DOI: 10.1016/S0019-9958(65)90241-X.