Charge carriers

Warren, William, Duane Dimos, Bruce Tuttle, Gordon Pike, Mark Raymond, Robert Nasby, Ramamoorthy Ramesh, and Joseph Evans Jr. "Mechanism(s) for the suppression of the switchable polarization in PZT and BaTiO3." Materials Research Society Symposium - Proceedings. Vol. 361. Materials Research Society, Pittsburgh, PA, United States, 1995. 51–65.

Lee, J, S Esayan, A Safari, and Ramamoorthy Ramesh. "Effect of ultraviolet light on fatigue of lead zirconate titanate thin-film capacitors." Applied Physics Letters 65 (1994) 254–256.