Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Fukuda Makoto and Harada Takayuki and Imano Kazuhiko,Application of high-polymer adhesive tape to closed-crack detection using second-harmonic ultrasonic pulse waves,Acoustical Science and Technology,13463969,ACOUSTICAL SOCIETY OF JAPAN,2015,36,2,175-177,https://cir.nii.ac.jp/crid/1390001205088472704,https://doi.org/10.1250/ast.36.175