Hackley V.A., Anderson M.A., Spooner S. - A small-angle X-ray-scattering study of microstructure evolution during sintering of sol-gel-derived porous nanophase titania. // Journal of Materials Research. 1992. V. 7. N. 9. P. 2555 - 2571.
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http://dx.doi.org/10.1557/JMR.1992.2555