1. Effects of load, grain size and grain boundaries on the hardness of alumina;Krell,1998
2. Dynamic deformation of polycrystalline alumina;Munson;J Appl Physics,1979
3. Shock-wave compression of sapphire from 15 to 420 kbar;Graham;J Phys Chem Solids,1971
4. Inherent reinforcement of ceramic microstructures by grain boundary engineering;Krell;J Europ Ceram Soc,1992
5. Veprek S. Novel nanocrystalline composites with hardness exceeding 50 GPa. Int J Refr. Metals & Hard Mater. (this volume).