Sun, Qiongge Zhou, Keya Fang, Guangyu Zhang, Guoqiang Liu, Zhengjun Liu, Shutian Media 1: Hollow sinh-Gaussian beams and their paraxial properties Originally published in Optics Express on 23 April 2012 (oe-20-9-9682) media;oe;Optics Express;Hollow;sinh-Gaussian;23 April 2012 2012-04-23
    https://opticapublishing.figshare.com/articles/media/Media_1_Hollow_sinh-Gaussian_beams_and_their_paraxial_properties/4945349
10.1364/OE.20.009682.m001