Fractional Helmholtz and Fractional Wave Equations with Riesz-Feller and Generalized Riemann-Liouville Fractional Derivatives. Eur. J. Pure Appl. Math. [Internet]. 2014 Aug. 1 [cited 2026 Feb. 23];7(3):312-34. Available from: https://www.ejpam.com/ejpam/article/view/2176