References:
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Qu, Q., Blom, H., Sanchez, S. and Ahlberg, P. (2015): Three-dimensional virtual histology of Silurian osteostracan scales revealed by synchrotron radiation microtomography. J. Morphol.2015 Aug;276(8):873-88. doi: 10.1002/jmor.20386. Epub 2015 Mar 21.