@article {Campbell1987,
	title = {Light trapping properties of pyramidally textured surfaces},
	journal = {Journal of Applied Physics},
	volume = {62},
	year = {1987},
	month = {Jan-01-1987},
	pages = {243},
	issn = {00218979},
	doi = {10.1063/1.339189},
	author = {Campbell, Patrick and Martin A Green}
}
