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	title = {Mangrove and wetland widlife at Sungei Buloh Nature Park },
	year = {2001},
	url = {http://www.naturia.per.sg/buloh/plants/resam.htm},
	author = {Ria Tan}
}
@article {633,
	title = {Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants},
	journal = {Nature},
	volume = {409},
	year = {2001},
	chapter = {618},
	doi = {10.1038/35054555},
	author = {Pryer, K. M. and Schneider, H. and Smith, A. R. and Cranfill, R. and Wolf, P.G. and Hunt, J. S. and Sipes, S. D.}
}
@article {557,
	title = {Mangrove fern},
	year = {2001},
	url = {http://www.naturia.per.sg/buloh/plants/acrostichum.htm },
	author = {Tan, R.}
}
