Spectroscopic properties of MO-WO3-P2O5: Ho3+ glasses P. Subbalakshmi, B. V. Raghavaiah, R. Balaji Rao, N. Veeraiah, P. Babu and C. K. Jayasankar Eur. Phys. J. Appl. Phys., 26 3 (2004) 169-176 Published online: 11 May 2004 DOI: 10.1051/epjap:2004035