Sokolenko, B V, S I Khalilov, A V Prisyazhniuk, and D A Poletaev. “Vortex Interferometric Microscopy With Laguerre-Gaussian Beams”. KnE Energy 3, no. 3 (April 25, 2018): 273–280. Accessed October 24, 2021. https://knepublishing.com/index.php/KnE-Energy/article/view/2038.