On WCG Banach spaces with norms which are uniformly differentiable in every direction Kutzarova, D. N.; Troyanski, S. L. — 1984 Proceedings of the 11th Winter School on Abstract Analysis
Some Geometric and Topological Properties of the Unit Sphere in a Banach Space. Pei-Kee Lin, Troyanski, S. L. Bor-Luh Lin — 1986 Mathematische Annalen