by Das, A, Sahana, M, Yusuf, S.M, Rao, L.Madhav, Shivakumara, C, Hegde, M.S
Published in Materials research bulletin (15.03.2000)

by Begum, R.J., Rao, L.Madhav, Umakantha, N.
Published in The Journal of physics and chemistry of solids (01.12.1962)