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BAO, P. T.; MUNG, L. Q. 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, [S. l.], v. 2, p. 105–116, 2021. Disponível em: https://tapchikhoahochongbang.vn/js/article/view/240. Acesso em: 21 tháng 6. 2026.