@article{ljs23013,
 author={Abd El-basit, W. and Abd, A. M. E. and Soliman, F. A. E. S.},
 year={2013},
 title={Mathematical Model for Photovoltaic Cells},
 journal={Leonardo J. Sci.},
 volume={12},
 number={23},
 pages={13-28},
 url={http://ljs.academicdirect.org/A23/013_028.pdf}
}