ULLAH, Inayat; IQBAL, Saleem; SARWAR, Farhana; REHMAN, Abdul. N-dimensional Fractional Fourier Transform and its Eigenvalues and Eigenfunctions. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 62, n. 1, p. 210–214, 2019. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/5494. Acesso em: 10 sep. 2025.