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Hideki NAITO, Yusuke SAIKI, Motoyuki SUZUKI, Ichiro IWAKI, Yasuhiro KODA, Kiyoshi KATO. "NON-DESTRUCTIVE TESTING OF CONCRETE SLAB BASED ON FORCED VIBRATION TEST USING PORTABLE SHAKER." Journal of Japan Society of Civil Engineers Ser E2 (Materials and Concrete Structures) 67.4 (2011) 522-534