%A International Acoustic Emission Symposium %A 山口, 楠雄 %T Progress in acoustic emission IV : proceedings of the 9th International Acoustic Emission Symposium, Kobe, Japan, November 14-17, 1988 %I The Japanese Society for Non-Destructive Inspection} %D 1988 %U https://ci.nii.ac.jp/ncid/BA09842699