Morozovska, A., C. Scherbakov, and M. Glinchuk. “Dependence of Soft Phonon Spectra on Flexoelectric Coupling in Ferroelectrics”. Ukrainian Journal of Physics 63, no. 2 (March 2, 2018): 168. Accessed June 26, 2019. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/118.