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\bibitem{Sahu_etal2009} Sahu, M., Bae, M. - H., Rogachev, A., Pekker, D., Wei, T. - C., Shah, N., et al. (2009). Individual topological tunnelling events of a quantum field probed through their macroscopic consequences. \textit{Nature Phys.}, \textit{5}, 503--508.

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