Hadad, Waseem Al, et al. “Regularization Using Truncated Singular Value Decomposition for Estimating the Fourier Spectrum of a Noised Space Distribution over an Extended Support”. Computer Assisted Methods in Engineering and Science, vol. 21, no. 3–4, Jan. 2017, pp. 211-22, https://cames3.ippt.pan.pl/index.php/cames/article/view/39.