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\bibitem{Vijande_etal2021} Vijande, J., Tedgren, A. C., Ballester, F., Baltas, D., Papagiannis, P., Rivard, M. J., et al. (2021). Source strength determination in iridium-192 and cobalt-60 brachytherapy: A European survey on the level of agreement between clinical measurements and manufacturer certificates. \textit{Phys. Imag. Radiat. Oncol.}, \textit{19}, 108--111.

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