“A Quadruple Integral Involving the Legendre Function Pn(x) of the First Kind: Derivation and Evaluation”.
European Journal of Pure and Applied Mathematics 15, no. 3 (July 31, 2022): 1113–1119. Accessed December 11, 2024.
https://www.ejpam.com/index.php/ejpam/article/view/4237.