“On the Bessel Operator $\odot_{B}^{t}$ Related to the Bessel-Helmholtz and Bessel Klein-Gordon Operator”. European Journal of Pure and Applied Mathematics 11, no. 4 (October 24, 2018): 922–928. Accessed November 21, 2024. https://www.ejpam.com/index.php/ejpam/article/view/3319.