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\bibitem{Liu_etal2013} {\textquotedblleft}\textit{Laser-induced periodic annular surface structures on fused silica surface}{\textquotedblright}. Liu Y, Brelet Y, He Z, Yu L, Forestier B, Deng Y, Jiang H, Houard A, Applied physics letters \textbf{102}, 251103 (2013).   http://doi.org/10.1063/1.4812354

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