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\bibitem{Yuan_etal2002} {\textquotedblleft}\textit{Long-distance channeling and focusing of lasers in plasmas}{\textquotedblright}. Yuan X, Yu W, Yu MY, Chen ZY, Liu JR, Lu PX, Li RX, Qian LJ, Lu BD, Physica scripta \textbf{66}, 381 (2002).   http://doi.org/10.1238/Physica.Regular.066a00381

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