1. 1) 大塚浩司,庄谷征美,原 忠勝他:コンクリート工学,朝倉書店,1989.
2. DETECTION OF FINE CRACKS IN REINFORCED CONCRETE THROUGH X-RAY TECHNIQUES USING CONTRAST MEDIA
3. 4) K. Otsuka: X-Ray Technique with Contrast Medium to Detect Fine Cracks in Reinforced Concrete, International Workshop on Fracture Toughness and Fracture Energy (Sendai, Tohoku Univ), 1988.
4. 5) K. Otsuka: Detection of Fracture Process Zone in Concrete by Means of X-Ray with Contrast Medium, Fracture Mechanics of Concrete Structures, Elsevier Applied Science, pp. 485-490, 1992.