Publikacja dostępna w wersji elektronicznej w open access na licencji CC BY 4.0.
Received: 31 December 2019, accepted: 18 January 2020, published: 1 February 2020. Publikacja wydana w: Special Issue "Multi-Criteria Decision Aid methods in fuzzy decision problems – part II" / editors Paweł Ziemba, Jarosław Jankowski. Ta publikacja należy do sekcji: "Computer and Engineer Science and Symmetry". Acknowledgments: "We dedicate our article to the late Professor Ryszard Budziński, Head of the Department of Management and Knowledge Engineering of the University of Szczecin, who was our scientific authority and mentor, an outstanding, noble, and kind man. The professor has always inspired us and supported all ourscientific activities".
The project is financed within the framework of the program of the Minister of Science and Higher Education under the name "Regional Excellence Initiative" in the years 2019–2022. 001/RID/2018/19 0,00 bezkosztowa
