1. R. P. Agnew, On equivalence of methods of evaluation of sequences, Tôhoku Math. J. vol. 35 (1932) pp. 244-252.
2. \bysame, Rogosinski-Bernstein trigonometric summability methods and modified arithmetic means, Ann. of Math. (to appear).
3. Über die Beziehung zwischen dem Bernsteinschen und Cesàroschen Limitierungsverfahren;Karamata, J.;Math. Z.,1949