RASKIN, L.; SIRA, O. Performing arithmetic operations over the (L–R)-type fuzzy numbers. Eastern-European Journal of Enterprise Technologies, [S. l.], v. 3, n. 4 (105), p. 6–11, 2020. DOI: 10.15587/1729-4061.2020.203590. Disponível em: https://journals.uran.ua/eejet/article/view/203590. Acesso em: 18 may. 2024.