“Fractional Helmholtz and Fractional Wave Equations with Riesz-Feller and Generalized Riemann-Liouville Fractional Derivatives”, Eur. J. Pure Appl. Math., vol. 7, no. 3, pp. 312–334, Aug. 2014, Accessed: Dec. 22, 2024. [Online]. Available: https://www.ejpam.com/index.php/ejpam/article/view/2176