Karazon, Abdel Hadi Mohamed, and Mohamed Mahmoud Amer. “(On Summability Of Double Fourier Series By (N,p,q,p ́,q ́ )(E,1,1”. Journal of Natural Sciences, Life and Applied Sciences, vol. 2, no. 4, Dec. 2018, pp. 40-25, https://doi.org/10.26389/AJSRP.A250718.