1. A. Aizpuru, F.J. García-Pacheco, L2-summand vectors in Banach spaces, Preprint, 2003
2. Characterizations of Inner Product Spaces;Amir,1986
3. J. Becerra, Transitividad de la norma en espacios de Banach, Doctoral Thesis, University of Granada, 1999
4. Isometric reflections on Banach spaces after a paper of Skorik and Zaidenberg;Becerra;Rocky Mountain J. Math.,2000
5. Strong differentiability of the norm and rotundity of the dual;Giles;J. Austral. Math. Soc.,1978