1. On approximate isometries;Hyers, D. H.;Bull. Amer. Math. Soc.,1945
2. 2. S. Banach, Théorie des opérations linéaires, 1932.
3. Uniformly convex spaces;Clarkson, James A.;Trans. Amer. Math. Soc.,1936
4. Some uniformly convex spaces;Boas, R. P., Jr.;Bull. Amer. Math. Soc.,1940
5. General ergodic theorems;Alaoglu, L.;Ann. of Math. (2),1940