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\bibitem{Cao_etal2004} {\textquotedblleft}\textit{Terahertz radiation from oscillating electrons in laser-induced wake fields}{\textquotedblright}. Cao L-H, Yu W, Xu H, Zheng C-Y, Liu Z-J, Li B, Bogaerts A, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{70}, 046408 (2004).   http://doi.org/10.1103/PhysRevE.70.046408

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