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22 Dec 2011 - 10:42
Stefan Heinrich’s density condition for Fréchet spaces and the characterization of the distinguished echelon spaces
Klaus D. Bierstedt and José Bonet, Stefan Heinrich’s density condition for Fréchet spaces and the characterization of the distinguished echelon spaces, Math. Nachr. 135 (1988), 149-180. MR0944226 (90a:46001) Zbl 0688.46001