NGUYEN, Xuan Truc; NGUYEN, Thi Hong Phuc; ONG, Van Tuyen; LUONG, Quoc Tuyen. ω-cover, k-cover and related spaces on the Pixley-Roy PR[X]. Dong Thap University Journal of Science - Natural Sciences Issue, [S. l.], v. 14, n. 5, p. 60–66, 2024. DOI: 10.52714/dthu.14.5.2025.1500. Disponível em: https://dthujs.vn/index.php/nsen/article/view/2009. Acesso em: 11 nov. 2026.