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. 2020 Oct 14;13(20):4554. doi: 10.3390/ma13204554

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© 2020 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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Eigenmodes of the reference RC plate with a four-point support in the corners according to Figure 4; graphic: Hering [17].