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. 2015 Jan 8;471(2173):20140465. doi: 10.1098/rspa.2014.0465

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — An array of cylindrical voids S₀ with the elementary cell S highlighted in dark grey. The distance between the centres of two adjacent voids is 2ℓ and the cell is infinite in the vertical direction.