참고문헌
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- Acta. Math. v.80 Spaces with non positive curvature H. Buseman
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- Uniform convexity, hyperbolic geometry and nonexpansive mappings K. Goebel;S. Reich
- J. Math. Soc. v.24 Approximation of nonlinear semigroups and evolution equations J. A. Goldstein
- Nolinear Anal. v.15 Nonexpansive iterations in hyperbolic spaces semigroups of nonlinear operators in Banach spaces S. Reich;I. Shafrir.