1. 31Kro: W. Von Kroll, “Tempered Titanium-Copper Alloys”,Z. Metallkd. 23, 33–39 (1931) in German. (Equi Diagram; Experimental)
2. 31Sch: E. E. Schumacher and W. C. Ellis, “Age Hardening of Copper-Titanium Alloys”,Metal and Alloys, 2, 111 (1931). (Meta Phases; Experimental)
3. 32Hen: F. R. Hensel and E. I. Larsen, “Age, Hardening Copper-Titanium Alloys”,Trans. AIME, 99, 55–64 (1932) (Equi Diagram)
4. 39Lav: F. Laves and H. J. Wallbaum, “On the Crystal Chemistry of Titanium Alloys”,Naturwissenschaften, 27, 674–675 (1939) in German. (Crys Structure; Experimental)
5. 51Kar: N. Karlsson, “An X-Ray Study of the Phases in t Copper-Titanium System”,J. Inst. Met., 79, 391–405 (1951). (Crys Structure; Experimental)