1.
Bao PT, Mung LQ. Multiple coverings of a closed set on a plane with non-Euclidean metrics by circles of two types. HIUJS [Internet]. 24 Tháng Chạp 2021 [cited 26 Tháng Sáu 2025];2:105-16. Available at: https://tapchikhoahochongbang.vn/js/article/view/240