Frigyes Riesz

Functional Analysis by Frigyes Riesz,Bela S-. Nagy,Bela Sz-Nagy Dover Publications Inc. Paperback 7 January 1991 from£16.99 | RRP: ~~£18.99~~
The General Theory of Dirichlet's Series (Dover Phoenix Editions) by Marcel Riesz,G. H. Hardy Dover Publications Hardcover 14 November 2005 from£13.95 | RRP: ~~£20.34~~