Castañeda, Román Vargas, David Franco, Esteban Media 2: Discreteness of the set of radiant point sources: a physical feature of the second-order wave-fronts Originally published in Optics Express on 03 June 2013 (oe-21-11-12964) Discretenes;media;oe;Optics Express;03 June 2013;wave-front;point sources 2013-06-03
    https://opticapublishing.figshare.com/articles/media/Media_2_Discreteness_of_the_set_of_radiant_point_sources_a_physical_feature_of_the_second-order_wave-fronts/4945478
10.1364/OE.21.012964.m002