1. K. Friedrich, “Zinc Sulphide as a Constituent of Mattes,”Metallurgie, 5,114–128 (1908) in German. (Equi Diagram; Experimental).
2. E.T. Allen and J.L. Crenshaw, “The Sulphides of Zinc, Cadmium, and Mercury; Their Crystalline Forms and Genetic Conditions,”Am. J. Sci.,34, 341–396 (1912). (Equi Diagram; Experimental).
3. E. Tiede and A. Schleede, “Fusion of the Sulphides of Zinc, Cadmium and Mercury,”Ber. Dtsch. Chem. Ges.,53B, 1717–1721(1920) in German. (Equi Diagram; Experimental).
4. I.A. Makolkin, “Standard Free Energies of Formation of Metal Sulfides Calculated from Electromotive Forces,”Acta Phys. U.R.S.S.,13, 361–368(1940). (Thermo; Experimental).
5. A.F. Kapustinsky and L.G. Chentzova, “Heats of Transformation in the System of Wurtzite-Sphalerite and Cinnabar-Metacinnabarite,”C. R. Acad. Sci. URSS, 30, 489–490 (1941). (Thermo; Experimental).