On absolute logarithmic summability of double Fourier series. P. L. Sharma — 1961 Bollettino dell'Unione Matematica Italiana
On the absolute negative summability of double Fourier series. P. L. Sharma — 1961 Bollettino dell'Unione Matematica Italiana
On [ F , d n ] summability of Fourier series P. L. Sharma; V. Prakash; S. K. Varma — 1985 Matematički Vesnik
On | V , λ | summability of a factored Fourier series P. L. Sharma; R. K. Jain — 1970 Matematički Vesnik