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. 2016 Jan 7;16(1):70. doi: 10.3390/s16010070

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

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

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3D model of the monolithic EE structure.