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. 2016 Mar 16;16(3):381. doi: 10.3390/s16030381

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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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Root mean square error (RMSE) and time for building the virtual database vary with different λ. (a) RMSE.; (b) time for building the virtual database.