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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/).

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(a,b) Senor probe based MZI and propylene carbonate [98,99], (c) sensing area and system using he NLC FP etalon [100], (d) sensing system based on tilted fiber Bragg grating (TFBG) and NLC [104]; permission conveyed through the Copyright Clearance Center, Inc.