Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) G. Arlt and N. A. Pertsev,Force constant and effective mass of 90° domain walls in ferroelectric ceramics,Journal of Applied Physics,0021-8979,AIP Publishing,1991-08-15,70,4,2283-2289,https://cir.nii.ac.jp/crid/1364233270422687104,https://doi.org/10.1063/1.349421