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. 2019 Jun 27;19(13):2860. doi: 10.3390/s19132860

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© 2019 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/).

PMC Copyright notice

(a) Sensing system of a magneto-optic fiber magnetic-field sensor [15] (Copyright © 2010 OSA, Reprinted with permission) and (b) sensing system based on the heterodyning fiber grating laser [19] (Copyright © 2013 OSA, Reprinted with permission).