Spectroscopic and physical properties of erbium doped Li2O– BaO–P2O5 glasses von Ramesh Babu, N.Ch, Raghava Rao, P., Narasimha Rao, N., Swami, B.J.R.S.N., Babu, M.Vasu, Naga Raju, G., Veeraiah, N.

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