Metric characterizations of hyperbolic and Euclidean spaces J. E. Valentine; S. G. Wayment — 1972 Colloquium Mathematicae
A local metric characterization of Banach spaces J. E. Valentine; S. G. Wayment — 1981 Colloquium Mathematicae
Generalized midset properties characterize geodesic circles and intervals L. D. Loveland; J. E. Valentine — 1978 Colloquium Mathematicae
Metric characterizations of Banach spaces J. E. Valentine; S. G. Wayment — 1973 Colloquium Mathematicae
Angles in metric and normed linear spaces Clyde F. Martin; J. E. Valentine — 1976 Colloquium Mathematicae