1. 4Toshio Sakurai, Takeshi Sato, and Atushi Yoshinaga ; pp.300 -21 inProceedings of The Fifth International Symposium on the Chemistry of Cement , Tokyo, 1968 , PartI , Vol. I . Organizing Committee for V-ISCC and Cement Association of Japan, 1968 .
2. 5N. A. Toropov ; pp.49 -53 in Ref. 4.