A Fixed Point Theorem for Local Pseudo-Contractions in Uniformly Convex Spaces. W.A. Kirk Manuscripta mathematica
Fixed point theorems in CAT(0) spaces and ℝ -trees. Kirk, W.A. — 2004 Fixed Point Theory and Applications [electronic only]
Local expansions and accretive mappings. Kirk, W.A. — 1983 International Journal of Mathematics and Mathematical Sciences
Nonexpansive mappings defined on unbounded domains. Kaewcharoen, A.; Kirk, W.A. — 2006 Fixed Point Theory and Applications [electronic only]