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\bibitem{Gontard_etal2012} {\textquotedblleft}\textit{Three-dimensional fabrication and characterisation of core-shell nano-columns using electron beam patterning of Ge-doped SiO$_{2}$}{\textquotedblright}. Gontard LC, Jinschek JR, Ou H, Verbeeck J, Dunin-Borkowski RE, Applied physics letters \textbf{100}, 263113 (2012).   http://doi.org/10.1063/1.4731765

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