Naji, Amgad Rashed, and Ammer Zain Othman. “Phase Space Localization of Orthonormal Sequences in \(L_α^2 (R_+^d)\)”. University of Aden Journal of Natural and Applied Sciences 24, no. 2 (October 31, 2020): 463–474. Accessed April 3, 2025. https://uajnas.adenuniv.com/index.php/uajnas/article/view/92.