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Bao, P. T., & Mung, L. Q. (2021). Multiple coverings of a closed set on a plane with non-Euclidean metrics by circles of two types. Tạp Chí Khoa học Trường Đại học Quốc Tế Hồng Bàng, 2, 105–116. Truy vấn từ https://tapchikhoahochongbang.vn/js/article/view/240