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Hardness of covalent crystals.
Gao F, He J, Wu E, Liu S, Yu D, Li D, Zhang S, Tian Y. Gao F, et al. Among authors: li d. Phys Rev Lett. 2003 Jul 4;91(1):015502. doi: 10.1103/PhysRevLett.91.015502. Epub 2003 Jul 2. Phys Rev Lett. 2003. PMID: 12906547