Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sakai Takenobu and Terai Youichi and Ishikiriyama Mamoru,Improvement in Durability of Piezoelectric Ceramics for Actuator.,Japanese Journal of Applied Physics,0021-4922,The Japan Society of Applied Physics,1995,34,9B,5276-5278,https://cir.nii.ac.jp/crid/1390282681223451904,https://doi.org/10.1143/jjap.34.5276