“On approximation of signals in Lip(α,r)-class using the product (N, pn,qn)(E,s)- summability means of conjugate Fourier series: On approximation of signals in $Lip(\alpha,r)$-class..”., NS, vol. 27, no. 2, May 2020, Accessed: Dec. 29, 2025. [Online]. Available: https://nonlinearstudies.com/index.php/nonlinear/article/view/1575