Averback, Robert S. (May 21, 1992). "Nanophase Ceramics: Final Report"(PDF). University of Illinois Urbana-Champaign. Archived(PDF) from the original on November 29, 2014. Retrieved 22 November 2014.
Averback, Robert S. (May 21, 1992). "Nanophase Ceramics: Final Report"(PDF). University of Illinois Urbana-Champaign. Archived(PDF) from the original on November 29, 2014. Retrieved 22 November 2014.