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4. Al-Khatatbeh, Y and Lee, K. K. M.; From superhard to hard: A review of transition metal dioxides TiO2, ZrO2, and HfO2 hardness, Journal of Superhard Materials, 36 (4), 2014, 231-245.
5. Bergman, M. I., Al-Khatatbeh, Y, Lewis, D. J., and Shannon, M. C.; Deformation of directionally solidified alloys: evidence for microstructural hardening of Earth’s inner core?, Comptes Rendus Geoscience, 346, 2014, 140-147.
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