Monsoriu, Juan A. Saavedra, Genaro Furlan, Walter D. Media 6: Fractal zone plates with variable lacunarity Originally published in Optics Express on 06 September 2004 (oe-12-18-4227) media;oe;lacunarity;Optics Express;06 September 2004;Fractal 2004-09-06
    https://opticapublishing.figshare.com/articles/media/Media_6_Fractal_zone_plates_with_variable_lacunarity/4931741
10.1364/OPEX.12.004227.m006