HELAL, Mohamed. “Darboux Problem for Fractional Partial Hyperbolic Differential Inclusions on Unbounded Domains With Delay”. Studia Universitatis Babeș-Bolyai Mathematica 67, no. 4 (December 2, 2022): 703–716. Accessed August 31, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2622.