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. 2021 Nov 3;14(21):6631. doi: 10.3390/ma14216631

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© 2021 by the author.

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 (https://creativecommons.org/licenses/by/4.0/).

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Sandwich-structured composites: (a) schematics showing elements of the sandwich structure [105]; (b) aluminum foam sandwich [105]; and (c,d) concept of applying the lightweight aluminum and ARPRO propylene-based foam sandwich material in a car (Inrekor, UK) [110].