Garodia, C., and S. Radenovic. “Оn a Proximal Point Algorithm for Solving Minimization Problem and Common Fixed Point Problem in CAT($k$) Spaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 75, no. 2, Mar. 2023, pp. 168 -1, doi:10.37863/umzh.v75i2.6770.