Gopal Krishna Singh. “On the Degree Of Approximation of Conjugate Function Belonging to Lip (ξ(t), P) Class of Conjugate Series of Fourier Series by Matrix Summability Method”. Journal of International Academy of Physical Sciences, vol. 22, no. 2, June 2018, pp. 141-5, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/138.