Geodesic
Opial's property and James' quasi-reflexive spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 2, pp. 283-289.

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Two of James' three quasi-reflexive spaces, as well as the James Tree, have the uniform $w^{\ast }$-Opial property.
Classification : 46B10, 46B20, 46B25, 47H10
Keywords: fixed points; James' quasi-reflexive spaces; James Tree; nonexpansive mappings; Opial's property; the demiclosedness principle 
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Kuczumow, Tadeusz; Reich, Simeon. Opial's property and James' quasi-reflexive spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 2, pp. 283-289. http://geodesic.mathdoc.fr/item/CMUC_1994__35_2_a8/