1. Singh, P.P.; Raman, A. (Trans. AIME 245 [1969] 1561/8).
2. Compton, V.B.; Matthias, B.T. (Acta Crystallogr. 12 [1959] 651/4).
3. Dwight, A.E.; Conner, R.A.; R.A., J.W. (Acta Crystallogr. 18 [1965] 837/9).
4. Geballe, T.H.; Matthias, B.T.; Compton, V.B.; Corenzwit, E.; Hull, G.W.; Longinotti, L.D. (Phys. Rev. [2] 137 [1965] A 119/A 127).
5. Virkar, A.V.; Singh, ; Raman, A. (Inorg. Chem. 9 [1970] 353/5).