1. H. P. Dikshit,The Nörlund summability of the conjugate series of a Fourier series, Rendiconti del Circolo Mat. di Palermo, serie II, XI (1962), 217–224.
2. G. H. Hardy,Divergent Series, (Oxford, 1949).
3. N. E. Nörlund,Sur une application des fonctions permutables, Lunds Universitets Årsskrift (2), 16 (1919), No. 3.
4. T. Pati,A generalisation of a theorem of Iyengar on the harmonic summability of Fourier series, Indian Jour. Math., 3 (1961), 85–90.
5. T. Pati,A generalisation of a theorem of Wang on the summability of Fourier series, Indian Jour. Math., 4 (1962), 35–45.