R.V. Mulkern, S.J. Chung, P.J. Bray, G.D. Chryssikos, D.E. Turcotte, W.M. Risen,
An NMR study of the photoconducting glass systems CdOB2O3GeO2 and CdOB2O3SiO2 Journal of Non-crystalline Solids. ,vol. 85, pp. 69- 78 ,(1986) ,
10.1016/0022-3093(86)90079-7