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. 2014 Nov 25;14(12):22261–22273. doi: 10.3390/s141222261

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/).

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Figure 5. — Block diagram of the interrogation unit.