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\bibitem{Santini_etal2006} Santini, M. T., Rainaldi, G., Ferrante, A., Indovina, P., Donelli, G., \& Indovina, P. L. (2006). A 50 Hz sinusoidal magnetic field does not damage MG-63 three-dimensional tumor spheroids but induces changes in their invasive properties. \textit{Bioelectromagnetics}, \textit{27}(2), 132--141.

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