K. Singh, H. Singh, V. Sharma, R. Nathuram, A. Khanna, R. Kumar, S. S. Bhatti and H. S. Sahota, “Gamma-Ray Attenuation Coefficients in Bismuth Borate Glasses,” Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 194, No. 1, 2002, pp. 1-6.
http://dx.doi.org/10.1016/S0168-583X(02)00498-6