1. G. Alexits,Convergence problems of orthogonal series, Pergamon Press (1961).
2. P. Chandra, On the degree of approximation of functions belonging to Lipschitz classNanta Math.,8 (1978), 88–91.
3. P. Chandra, On the generalized Fejér means in the metric of the Hölder space, to appear.
4. G. H. Hardy,Divergent Series (Oxford, 1949).
5. L. McFadden, Absolute Nörlund summability,Duke Math. J.,9 (1942), 168–207.