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. 2016 Feb 16;9(2):112. doi: 10.3390/ma9020112

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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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Figure B1 — Typical $V (z)$ curve. Surface acoustic-wave velocity can be obtained from $Δ z$ .