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. 2018 Jun 28;5:17. doi: 10.1186/s40580-018-0149-y

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — a Experimental procedure of ball-millng method. b SEM and c TEM image of BNNTs produced by the ball-milling method. Cylindrical- and bamboo-like shape of BNNTs is shown in TEM image.

Reproduced with permission from [36], copyright 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved