Igor K. Bdikin, Andrei L. Kholkin, Anna N. Morozovska, Sergei V. Svechnikov, Seung-Hyun Kim, and Sergei V. Kalinin, Domain dynamics in piezoresponse force spectroscopy: Quantitative deconvolution and hysteresis loop fine structure, Applied Physics Letters, 92, 182909, 2008. https://doi.org/10.1063/1.2919792