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Stoyanov, Lyubomir, Maya Zhekova, Aleksander Stefanov, Ivan Stefanov, Gerhard G. Paulus, and Alexander Dreischuh. "Zeroth- and First-order Long Range Non-diffracting Gauss–Bessel Beams Generated By Annihilating Multiple-charged Optical Vortices." Sci Rep 2020.

Stoyanov, Lyubomir, et al. "Zeroth- and First-order Long Range Non-diffracting Gauss–Bessel Beams Generated By Annihilating Multiple-charged Optical Vortices." Sci Rep 2020.