1. 3F. M. Lea , Chemistry of Cement and Concrete , pp.172 -73 , 172 -73 . Edward Arnold & Co., London; St. Martin's Press, Inc., New York, 1956 . 172 pp.; Ceram. Abstr., 1956 , p.172 .
2. 4R. H. Bogue , Chemistry of Portland Cement , 2d ed. , pp.563 -68 . Reinhold Publishing Corp., New York, 1955 . 563 pp.Ceram. Abstr., 1955 , p.563 .