A. Carbajal-Domínguez, J. Arroyo, J. Gómez Correa, G. Niconoff, and G. Niconoff, “Numerical calculation of near field scalar diffraction using angular spectrum of plane waves theory and FFT”, Rev. Mex. Fis. E, vol. 56, no. 2 Jul-Dec, pp. 159–164, Jan. 2010.