1. “Experimental Researches on Constitution of Hydraulic Mortars”;LeChatelier,1905
2. Ternary system CaO-Al2O3-SiO2, (Optical study by F. E. Wright);Rankin;Am. J. Sci.,1915
3. Tricalcium aluminate and microstructure of portland cement clinker;Brown;Am. Soc. Testing Materials Proc.,1937
4. Microscopic structure of hydrated portland cement;Brownmiller;J. Am. Concrete Inst.,1943