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Sergey V. Tsybulya and Galina N. Kryukova
Nanocrystalline transition aluminas: Nanostructure and features of x-ray powder diffraction patterns of low-temperature Al2O3 polymorphs, Phys. Rev. B 77, 024112 (2008)
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http://dx.doi.org/10.1103/PhysRevB.77.024112