Shunzo Kawajiri, Takayuki Kawaguchi, Shintaro Yamasaki, Dai Nakamura, Satoshi Yamashita, and Satoru Shibuya, “STRENGTH CHARACTERISTICS OF COMPACTED SOIL WITH PARTICULAR REFERENCE TO SOIL STRUCTURE AND ANISOTROPY”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 13, no. 38, pp. 178–185, May 2017.