Effective atomic number (for gamma ray) Z $\{$sub eff$\}$ of compounds. Hung, P. Q., Loat, B. V., & others Communications in Physics, 1992.
bibtex   
@article{hung1992effective,
title={Effective atomic number (for gamma ray) Z $\{$sub eff$\}$ of compounds},
author={Hung, Pham Quoc and Loat, Bui Van and others},
journal={Communications in Physics},
volume={2},
year={1992}
}

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