1. N. A. Nedomov and V. I. Rabezova,Izv. Akad. Nauk SSSR Otd. Tekh. Nauk Met. Topl., 1961 (4), p 68–70 (1961). mal analysis and metallographic techniques employed for about 16 alloys in the composition range 20 to 100 at. %Nb prepared from 99.3% Nb and 99.9% Al)
2. V.V. Baron and E. M. Savitskii,Zh. Neorg. Khim., 6, p 182–185 (1961);Russ. J. Inorg. Chem., 6, p 90–92 (1961). (Determination of the system, primarily solidus, by thermal analysis of 29 alloys prepared from 99.0% Nb and 99.99% Al. X-ray and metallography techniques were used for corroboration)
3. C. E. Lundin and A. S. Yamamoto,Trans. AIME, 236, p 863–872 (1966). (Determination of the system primarily by metallographic analysis of cast and annealed specimens (over 500) of 127 alloy compositions prepared from 99.9+% Nb and 99.99+% Al. Hardness, thermal analysis, and x-ray techniques were used for supplementary work)
4. M. J. Richards,Mem. Sci. Rev. Met., 61, p 265–270 (1964). (Metallographic study with corroborating x-ray work of 29 alloys prepared from 97.7% Nb and 99.995% Al. Liquidussolidus of Nb-rich portion not investigated)
5. W. W. Beaver, A. J. Stonehouse and R. M. Paine, Plansee Proceedings, 1964 (Metals for the Space Age), p 682–700, Metallwerk Plansee AG, Reutte/Tirol (1965).