S. KatsyvV. KukharchukN. KondratenkoV. KucherukP. KulakovD. Karabekova2023-10-272023-10-272023Katsyv, S. Development of the fuzzy sets theory: weak operations and extension principles / S. Katsyv, V. Kukharchuk, N. Kondratenko, V. Kucheruk, P. Kulakov, D. Karabekova // Bulletin of the Karaganda University. «Mathematics» series., № 3(111)/2023, p. 59 – 71, DOI 10.31489/2023M3/59-71DOI 10.31489/2023M3/59-71https://lib.udau.edu.ua/handle/123456789/9681enСтаття