[1] Edgar ASPLUND:
Averaged norms. Israel Journ. of Math. 5 (1967), 227-233.
MR 0222610
[2] Arne BRØNDSTED:
Conjugate convex functions in topological vector spaces. Mat. - fys. Medd. Det Kong. Dan. Vid. Sels. 34, no 2 (1964).
MR 0166580
[3] Dennis F. CUDIA:
Rotundity. Proc. of Symp. in. Pure Math. Vol. VII Convexity (1963).
MR 0155166
[4] Dennis F. CUDIA:
The geometry of Banach spaces. Smoothness Trans. of the Am. Math. Soc. 110 (1964), 284-314.
MR 0163143
[5] V. L. ŠMULJAN: On some geometrical properties of the sphere in a space of the type B. Comptes Rendus de l'Acad. des Sc. de l'URSS, XXIV (1939), 7.
[6] V. L. ŠMULJAN: Sur la Dérivabilité de la Norme dans l'Espace de Banach. Dokl. Ak. Nauk SSSR XXVII (1940), N. 7, 643-648.
[7] V. ZIZLER:
Banach spaces with the differentiate norms. Comment. Math. Univ. Carolinse 8, 3 (1967), 415-440.
MR 0246121