A. K. Singh, R. P. Guragain, J. J. Nakarmi, L. N. Jha, and H. B. Baniya, “Study of Time Correlation and Memory Function for the Derivation of Spectral Density in Plasma”, Amrit Res. J., vol. 4, no. 1, pp. 52–60, Dec. 2023, doi: 10.3126/arj.v4i1.61285.