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. 2020 Oct 15;13(20):4590. doi: 10.3390/ma13204590

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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/).

PMC Copyright notice

TEM (a) image and corresponding elemental mapping (b–e) images of Fe₃O₄@MoS₂ nanocomposites [87]. Reproduced with permission from [Yufu Xu et al.], [Tribology International]; published by [Elsevier], 2018.