1. 1) G. Yagawa and T. Fukuda, “Crack shape recognition using electrical potential drop method”, Proc., JSME, No.820-11, p.290 (1982).
2. 2) G. Yagawa and T. Fukuda, “Application of electrical potential drop method in fracture mechanics II”,Kikainokenkyu,Vol.35, pp.1324-1330 (1983).
3. 3) K. Ohji, S. Kubo and T. Sakagami, “Electric potential CT method for measuring location and size of two-and three-dimensional cracks. (Development of boundary element inverse analysis method for electric potential problems and its application to non-destructive crack measurement)”, Trans. JSME, Vol.51, pp.1818-1827 (1985).
4. 4) K. Ohji, S. Kubo, T. Sakagami and T. Hashimoto, “Experimental study on two-dimensional crack shape measurement by electrical potential CT method”, J. JSMS, Vol.35, pp.942-947 (1986).
5. 5) S. Kubo, T. Sakagami, K. Ohji, T. Hashimoto and Y. Matsumuro, “Quantitative measurement of three-dimensional surface cracks by the electric potential CT method”, Trans. JSME, Vol.54 pp.218-225 (1988).