@article{lejpt20061,
 author={Egwuonwu, G. N. and Bukar, P. H. and Avaa, A.},
 year={2012},
 title={Investigation of the use of Ishiagu Galena Concrete in E-M Radiation Sheilding},
 journal={Leonardo Electron. J. Pract. Technol.},
 volume={11},
 number={20},
 pages={61-74},
 url={http://lejpt.academicdirect.org/A20/061_074.pdf}
}