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\bibitem{Dantas_etal2013} {\textquotedblleft}\textit{Low-dimensional confining structures on the surface of helium films suspended on designed cavities}{\textquotedblright}. Dantas DS, Chaves A, Farias GA, Ramos ACA, Peeters FM, Journal of low temperature physics \textbf{173}, 207 (2013).   http://doi.org/10.1007/s10909-013-0895-5

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