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\bibitem{Chen+Bogaerts2005} {\textquotedblleft}\textit{Laser ablation of Cu and plume expansion into 1 atm ambient gas}{\textquotedblright}. Chen Z, Bogaerts A, Journal of applied physics \textbf{97}, 063305 (2005).   http://doi.org/10.1063/1.1863419

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