Tauberian conditions for absolute convergence. P. Chandra — 1973 Publications de l'Institut Mathématique [Elektronische Ressource]
A new criterion for the absolute Riesz summability of the conjugate series of a Fourier series P. Chandra — 1972 Matematički Vesnik
A note on degree of approximation by Nörlund and Riesz operators P. Chandra — 1990 Matematički Vesnik