10.1364/OPEX.13.004379.m017 D. Jović D. Jović D. Arsenović D. Arsenović A. Strinić A. Strinić M. Belić M. Belić M. Petrović M. Petrović Media 17: Counterpropagating optical vortices in photorefractive crystals Optica Publishing Group 2005 13 June 2005 media oe Optics Express vortice photorefractive crystals Counterpropagating 2005-06-13 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_17_Counterpropagating_optical_vortices_in_photorefractive_crystals/4932806 Originally published in Optics Express on 13 June 2005 (oe-13-12-4379)