@article{lejpt19029,
 author={Ogunbode Hassan, E. B. a. I. O.},
 year={2011},
 title={Effect of Addition of Calcium Nitrate on Selected Properties of Concrete Containing Volcanic Ash},
 journal={Leonardo Electron. J. Pract. Technol.},
 volume={10},
 number={19},
 pages={29-38},
 url={http://lejpt.academicdirect.org/A19/029_038.pdf}
}