DIPANKAR RANA; SANKAR KUMAR ROY. Lattice for covering rough approximations. Malaya Journal of Matematik, India, v. 2, n. 03, p. 222–227, 2014. DOI: 10.26637/mjm203/006. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/410. Acesso em: 22 nov. 2024.