@article {Green1981,
	title = {Solar cell fill factors: General graph and empirical expressions},
	journal = {Solid-State Electronics},
	volume = {24},
	year = {1981},
	note = {<br />},
	pages = {788 - 789},
	issn = {00381101},
	doi = {10.1016/0038-1101(81)90062-9},
	author = {Martin A Green}
}
