著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Jianjun Qu and Wenfeng Guo and Yanli Wang,Effects of wear of friction material on performance of ultrasonic motor,"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology",1350-6501,SAGE Publications,2012-11-14,227,4,362-372,https://cir.nii.ac.jp/crid/1360292619293196928,https://doi.org/10.1177/1350650112463530