UŽGA-REBROVS, Oļegs. KNOWLEDGE REPRESENTING FEATURES IN ROUGH SETS THEORY. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 2, p. 169–176, 2015. DOI: 10.17770/etr2009vol2.1045. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1045.. Acesso em: 4 may. 2024.