1. L. Fejér, Math. Annalen, Bd. 58, 1904, p. 51. G. H. Hardy, Proc. Lond. Math. Soc. (2), vol. 3, 1906, p. 247; and Math. Annalen, Bd. 64, 1907, p. 77. C. N. Moore, Trans. Amer. Math. Soc. vol. 8, 1907, p. 299.
2. See E. Landau, Münchener Sitzungsberichte Bd. 36, 1906, pp. 157, 160.
3. Trans. Amer. Math. Society, vol. 8, April 1907, p. 300.
4. Math. Annalen, Bd. 64, p. 78.
5. See p. 86 of the paper quoted.