Functional analysis / Frigyes Riesz and Bela Sz-Nagy ; translated from the 2nd French edition by Leo F. Boron. Riesz, Frigyes. Szokefalvi-Nagy, Bela, 1913- Boron, Leo F. Functional analysis. 517 RIF London : Blackie, 1956. 1956. 1956 Text xii, 467 p. : eng