Abdulkasim Akhmedov, Mohd Zuki Salleh, Abdumalik Rakhimov. The Approximation of the Solution of Wave Problems by Spectral Expansions Connected with Elliptic Differential Operators. J. Adv. Res. Fluid Mech. Therm. Sc. [Internet]. 2024 Mar. 28 [cited 2024 Nov. 25];86(2):101-6. Available from: https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/8147