1.
Xun Ge, Jingyu Qian. A fixed point theorem for contractive closed-valued mappings on metric spaces. Sci. Ser. A Math. Sci. (N.S.) [Internet]. 2008 Jan. 15 [cited 2025 Jun. 7];16:105-8. Available from: https://revistas.usm.cl/scientia/article/view/114