1. Aksoy, A.G., Khamsi, M.A.: Nonstandard Methods in Fixed Point Theory. Springer, New York, Berlin (1990)
2. Alspach, D.E.: A fixed point free nonexpansive map. Proc. Am. Math. Soc. 82, 423–424 (1981)
3. Aronszajn N., Panitchpakdi, P.: Extensions of uniformly continuous transformations and hyperconvex metric spaces. Pac. J. Math. 6, 405–439 (1956)
4. Bae, J.S., Park, M.S.: Fixed point theorems in metric Spaces with uniform normal structure. J. Kor. Math. Soc. 30, 51–62 (1993)
5. Baillon, J.B.: Quelques aspects de la théorie des points fixes dans les espaces de Banach I. Séminaire d’ Analyse Fonctionnelle de l’École Polytechnique VII (1978–1979). École Polytechnique, Palaiseau (1979) (in French)