RASKIN, L.; SIRA, O. Development of methods for extension of the conceptual and analytical framework of the fuzzy set theory. Eastern-European Journal of Enterprise Technologies, [S. l.], v. 6, n. 4 (108), p. 14–21, 2020. DOI: 10.15587/1729-4061.2020.217630. Disponível em: https://journals.uran.ua/eejet/article/view/217630. Acesso em: 20 jul. 2024.