1. 27Lai: M.J. Laissus, “Bonding of Iron Alloys by Tantalum,”Rev. Metall., 24, 387–395 (1927) in German. (Equi Diagram; Experimental)
2. 29Wea: F. Weaver, “Influence of Alloying Elements on Allotropes of Iron,”Arch. Eisenhüttenwes., 2, 739–746 (1929) in German. (Crys Structure, Equi Diagram; Theory)
3. 35Jel: W. Jellinghaus, “The Iron-Tantalum Binary System,”Z. Anorg. Chem., 223, 362–364 (1935) in German. (Crys Structure, Equi Diagram; Experimental)
4. Indicates key paper36Gen: R. Genders and R. Harrison, “Tantalum-Iron Alloys and Tantalum Steels,”J. Iron Steel Inst., 134, 173–209 (1936). (Equi Diagram; Experimental; Indicates presence of a phase diagram).
5. 38Nem: V.A. Nemilov and N.M. Voronov, “Iron-Tantalum Alloys,”Bull. Acad. Sci. USSR, 905–911 (1938) in Russian. (Equi Diagram; Experimental; Indicates presence of a phase diagram).