Natural frequencies

Wolpert, D, W Cox, J Cerne, A Markelz, T Zhao, and Ramamoorthy Ramesh. "Finite size effects in ferroelectric nanosystems: Absence of mode softening." 2003 Nanotechnology Conference and Trade Show - Nanotech 2003. Ed. Romanowicz M. Vol. 2. 2003. 76–79.

Liang, H.Y, I.I Smolyaninov, J Li, V Nagarajan, Ramamoorthy Ramesh, C.C Davis, and C.H Lee. "Electric field induced SHG in PZT thin films studied using near-field scanning optical microscopy." OSA Trends in Optics and Photonics Series. Vol. 88. Optical Society of American (OSA), 2003. 1685–1686.