1. 1 I. Akimoto: Journal of MMIJ, 110 (1994), 1017-1022.
2. 2 Hokkaido Bureau of International Trade and Industry, Tohoku Bureau of International Trade and Industry, Kanto Bureau of International Trade and Industry, Chubu Bureau of International Trade and Industry, Kinki Bureau of International Trade and Industry, Chugoku Bureau of International Trade and Industry, Shikoku Bureau of International Trade and Industry, Kyushu Bureau of International Trade and Industry, Okinawa Bureau of International Trade and Industry: Journal of MMIJ, 110 (1994), 1048-1071.
3. 3 M. Abe: Concrete Journal, Vol.46, No.5 (2008), 4-10.
4. 4 (一社) 日本砕石協会: ホームページ [Japan Crushed Stone Association Home Page]
5. 5 M. Terada: Journal of MMIJ, 110 (1994), 1033-1036.