Amer MM. ([On Summability Of Double Fourier Series And It’s Conjugate By Double Nörlund in The Space L_2 ([0,π]×[0,π . JNSLAS [Internet]. 2019 Sep. 30 [cited 2025 Dec. 20];3(3):84-71. Available from: https://www.ajsrp.ojsexpert.com/index.php/jnslas/article/view/1742