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M. M. Day, Normed linear spaces, Ergebnisse der Math. und ihre Grenzgebiete, (N. F.) Heft 28, 1958. MR 0094675 (20:1187)

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J. Gil de Lamadrid, Topology of mappings and differentiation processes, Illinois J. Math. 3 (1959), 408-420. MR 0107193 (21:5918)

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A. Grothendieck, Produits tensoriels topologiques et espaces nucléaires, Mem. Amer. Math. Soc. No. 16 (1955) 140 pp. MR 0075539 (17:763c)

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S. Kakutani. Some characterizations of euclidean spaces, Jap. J. Math. 16 (1939), 93-97. MR 0000895 (1:146d)

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J. Leray and J. Schauder, Topologie et équations fonctionnelles, Ann. Sci. École Norm. Sup. (3) 5 (1934), 45-78. MR 1509338

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M. Nagumo, Degree of mapping in convex topological spaces, Amer. J. Math. 73 (1951), 497-511. MR 0042697 (13:150b)

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E. H. Rothe, Gradient mappings in Banach spaces, Duke Math. J. 15 (1948), 421-434. MR 0029104 (10:548d)