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. 2015 Nov 6;15(11):28088–28098. doi: 10.3390/s151128088

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© 2015 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/).

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Response and recovery measurements of (a) MQ-3 sensor measured in the resistivity mode; and (b) MiCS-5914 sensor measured in the voltage mode, at different relative humidities.