MathSciNet bibliographic data MR2386391 47H10 (41A50 41A65 54H25) Shahzad, Naseer; Markin, Jack Invariant approximations for commuting mappings in $\rm CAT(0)$$\rm CAT(0)$ and hyperconvex spaces. J. Math. Anal. Appl. 337 (2008), no. 2, 1457–1464. Article

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