1. 04Hey: E. Heyn, “Copper and Oxygen”,Z. Anorg. Chem., 39, 1–23 (1904) in German. (Equi Diagram; Experimental)
2. 12Sla: R.E. Slade and F.D. Farrow, “An Investigation of the Dissociation Pressures and Melting Points of the System Copper-Cuprous Oxide”,Proc. R. Soc. London, Ser. A, 87, 524–534 (1912). (Equi Diagram; Experimental)
3. 29Vog: R. Vogel and W. Pocher, “The System: Copper-Oxygen”,Z. Metalkd., 21, 333–337, 338–371 (1929) in German. (Equi Diagram; Experimental)
4. 41Phi: A. Phillips and E.N. Skinner, “Solubility of Oxygen in High-Purity Copper”,Trans. AIME, 143, 301–311 (1941). (Equi Diagram; Experimental)
5. 55San: K. Sano and H. Sakao, “Physico-Chemical Investigation on Copper Smelting. I. The Equilibrium Relation Between Liquid Copper and Carbon Monoxide-Carbon Dioxide Gas Mixtures”,Nippon Kinzoku Gakkaishi, 19, 431–435; II. Thermodynamic Consideration for Experimental Results on the Equilibrium Between Liquid Copper and Carbon Monoxide-Carbon Dioxide Gas Mixtures”, 435–438 (1955) in Japanese. (Thermo; Experimental)