@article {rafat2006photon,
	title = {Photon recycling in the graded bandgap solar cell},
	journal = {Progress in Photovoltaics: Research and Applications},
	volume = {14},
	number = {4},
	year = {2006},
	note = {<p>n/a</p>
},
	pages = {313{\textendash}320},
	publisher = {Wiley Online Library},
	abstract = {<p>n/a</p>
},
	author = {NH Rafat and AM Abdel Haleem and SED Habib}
}
