@article {136,
	title = {Terrestrial pteridophytes as indicators of a forest-like environment in rubber production systems in the lowlands of Jambi, Sumatra.},
	journal = {Agriculture, Ecosystems and Environment Agriculture, Ecosystems and Environment},
	volume = {104},
	year = {2004},
	pages = {63-73},
	author = {Beukema, H., and Noordwijk, M.V.,}
}
