Liu, P.-L.P.-L.LiuYeh, P.-L.P.-L.YehPEI-LING LIU2020-04-282020-04-282011https://scholars.lib.ntu.edu.tw/handle/123456789/486766Spectral tomography of concrete structures based on impact echo depth spectrajournal article10.1016/j.ndteint.2010.09.0132-s2.0-80052035069https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052035069&doi=10.1016%2fj.ndteint.2010.09.013&partnerID=40&md5=ad4416de56eb674589387df28077d58d