1. 2) H. Hojo, K. Tsuda, K. Ogasawara & K. Mishima: Proc. 4th Int. Conf. on Composite Materials, 1017 (1982).
2. 3) H. Hojo, K. Tsuda & T. Yabu: Wear, 112, 17 (1986).
3. 4) C. M. Thai, K. Tsuda & H. Hojo: J. of Testing and Evaluation, 9, 359 (1981).
4. 6) H. Hojo, K. Tsuda, K. Ogasawara & T. Takizawa: ACS Symp. Ser., 322, 314 (1986).
5. 7) A. Barletta & A. Ball: Proc. 6th Int. Conf. on Erosion by Liquid and Solid Impact, 1-1 (1983).