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. 2014 Dec 2;9(12):e113797. doi: 10.1371/journal.pone.0113797

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© 2014 Xue et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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a is cement sample allowed to set for 0.5 h; b is cement sample allowed to set for 1 h; c is cement sample allowed to set for 2 h; d is cement sample allowed to set for 4 h.