Nigam, H. K., & Sharma, A. (2009). On (N, p, q)(E, 1) Summability of Fourier Series. International Journal of Mathematics and Mathematical Sciences, 2009(), 1271-1278. https://doi.org/10.1155/2009/989865
FRIDY, J. A. (1997). NONINCLUSION THEOREMS FOR SUMMABILITY MATRICES. International Journal of Mathematics and Mathematical Sciences, 1997(), 511-516. https://doi.org/10.1155/S0161171297000690