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\bibitem{Bekshaev_etal2001} {\textquotedblleft}\textit{Application of light beams with non-zero angular momentum in optical study of micrometer-size aerosol particles}{\textquotedblright}. Bekshaev A, Kontush S, Popov A, Van Grieken R, , 288 (2001).   http://doi.org/10.1117/12.428282

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