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\bibitem{Nelissen_etal2009} {\textquotedblleft}\textit{Work and dissipation in 2D clusters}{\textquotedblright}. Nelissen K, Partoens B, van den Broeck C, Europhysics letters \textbf{88}, 30001 (2009).   http://doi.org/10.1209/0295-5075/88/30001

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