OGUNSEYE Olatunde, Takeshi WatanabeandChikanori Hashimoto : EXPERIMENTAL INVESTIGATION OF CONCRETE QUALITY CONDITION BY IMPACT WAVEFORM, Proc.of the Japan Concrete Institute, Vol.40, No.1, 1761-1766, 1018.
Takeshi Watanabe, Chikanori HashimotoandMasayasu Ohtsu : Scanning Procedure of Impact Echo for Detecting Defects in Concrete Structure, Proceedings of the first fib Congress 2002, Vol.8, No.15, 19-28, Osaka, Oct. 2002.
K. Nishikawa, Hiroyuki Mizuguchi, Chikanori HashimotoandH. Tsutsui : Mechanical properties of self-compaction concrete using recycled material from demolished concrete structure as aggregate and powder, RILEM Proceedings, Vol.54, (号), 887-892, Ghent, Sep. 2007.