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. 2016 Dec 16;16(12):2161. doi: 10.3390/s16122161

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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 Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Rotational seismometers based on FOG: (a) LCG-demonstrator [40]; (b) μFORS-1 [89]; (c) AFORS-1; (d) BlueSies-3A [93].