Nguyen, X. T., Nguyen, T. H. P., Ong, V. T., & Luong, Q. T. (2024). ω-cover, k-cover and related spaces on the Pixley-Roy PR[X]. Dong Thap University Journal of Science - Natural Sciences Issue, 14(5), 60-66. https://doi.org/10.52714/dthu.14.5.2025.1500