@article{ljs25031,
 author={Omaka, N. and Offor, I. and Nwali, C.},
 year={2014},
 title={X-Ray fluorescence determination of potentially toxic elements in quarry dust from Umuoghara industrial crushing site},
 journal={Leonardo J. Sci.},
 volume={13},
 number={25},
 pages={31-42},
 url={http://ljs.academicdirect.org/A25/031_042.pdf}
}