1. 29Sie: A. Sieverts, “Absorption of Gases by Metals,”Z. Metallkd., 21, 37–46 (1929). (Equi Diagram; Experimental)
2. 34Smi: J. Smittenberg, “Absorption and Adsorption of Hydrogen by Nickel,”Rec. Trav. Chim. Pays-Bas, 53, 1065–1083 (1934). (Equi Diagram; Experimental)
3. 34Gay: A. G. Gaydon and R. W. B. Pearse, “Band Spectrum of Nickel Hydride: Bands at I 5713, I 6246, I 6424,”Proc. R. Soc. (London) A, 148, 312–335 (1935). (Equi Diagram; Experimental)
4. 43Arm: M. H. Armbruster, “The Solubility of Hydrogen at Low Pressure in Iron, Nickel, and Certain Steels at 400 to 6000,”J. Am. Chem. Soc., 65, 1043–1054 (1943). (Equi Diagram; Experimental)
5. 48Smi: D. P. Smith,Hydrogen in Metals, University of Chicago Press, Chicago, 366 p (1948) (Equi Diagram, Crys Structure; Review)