1. Bernstein, S.: Sur la convergence absolue des s�ries trigonom�triques, Comptes rendus, 8 June 1914.
2. Hardy, G. H.: Some properties of integrals of fractional order, Messenger of Mathematics47 (1918), p. 145?150.
3. ?: Weierstrass's non-differentiable function, Trans. Amer. Math. Soc.17 (1916), p. 301?325.
4. Hardy, G. H., and Littlewood, J. E.: Some properties of fractional integrals, Proc. London Math. Soc. (2),24 (1925), p. xxxvii-xli (Records for 12 March 1925).
5. ??: On Parseval's Theorem, Proc. London Math. Soc. (2),26 (1927), p. 287?294.