Adil, N., and A.S. Berdyshev. “Spectral Properties of Local and Nonlocal Problems for the Diffusion-Wave Equation of Fractional Order”. Bulletin of the Karaganda University. Mathematics Series 110, no. 2 (June 30, 2023): 4–20. Accessed July 10, 2025. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/562.