MathSciNet bibliographic data MR2129569 (2005m:54064) 54H25 (05C10 47H10 57M20) Kirk, W. A. Fixed point theorems in $\rm CAT(0)$$\rm CAT(0)$ spaces and $\Bbb R$$\Bbb R$-trees. Fixed Point Theory Appl. 2004, no. 4, 309–316. Article

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