@article {Powers:December 1997:0378-1127:43,
	author = "Powers J.S.",
	author = "Haggar J.P.",
	author = "Fisher R.F.",
	title = "The effect of overstory composition on understory woody regeneration and species richness in 7-year-old plantations in Costa Rica",
	journal = "Forest Ecology and Management",
	volume = "99",
	year = "December 1997",
	abstract = "",
	pages = "43-54(12)",
	url = "http://www.ingentaconnect.com/content/els/03781127/1997/00000099/00000001/art00193"
	doi = "doi:10.1016/S0378-1127(97)00193-X"
}