Ullah, Inayat, Saleem Iqbal, Farhana Sarwar, and Abdul Rehman. “N-Dimensional Fractional Fourier Transform and Its Eigenvalues and Eigenfunctions”. American Scientific Research Journal for Engineering, Technology, and Sciences 62, no. 1 (December 12, 2019): 210–214. Accessed September 10, 2025. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/5494.