Li, Wen-Hui, Dongkyu Lim, and Feng Qi. “Expanding the Function $\ln(1+\operatorname{e}^x)$ into Power Series in Terms of the Dirichlet Eta Function and the Stirling Numbers of the Second Kind”. Carpathian Mathematical Publications 16, no. 1 (June 30, 2024): 320–327. Accessed July 3, 2024. http://pu.if.ua/index.php/cmp/article/view/6528.