Nguyen, Xuan Truc, Thi Hong Phuc Nguyen, Van Tuyen Ong, and Quoc Tuyen Luong. 2024. “ω-Cover, K-Cover and Related Spaces on the Pixley-Roy PR[X]”. Natural Sciences Issue 14 (5):60-66. https://dthujs.vn/index.php/nsen/article/view/2009.