@article {rafat1998limiting,
	title = {The limiting efficiency of band gap graded solar cells},
	journal = {Solar energy materials and solar cells},
	volume = {55},
	number = {4},
	year = {1998},
	note = {<p>n/a</p>
},
	pages = {341{\textendash}361},
	publisher = {Elsevier},
	abstract = {<p>n/a</p>
},
	author = {NADIA H. RAFAT and S. E.-D. Habib}
}
