@article {555,
	title = {Fruits and seeds of Ruppia (Potamogetonaceae) from the Pliocene of Yushe Basin, Shanxi, northern China and their ecological implications},
	journal = {Botanical Journal of the Linnean Society},
	volume = {145},
	year = {2004},
	pages = {317{\textendash}329},
	doi = {10.1111/j.1095-8339.2003.00278.x},
	author = {Zhao, L.-C. and Collinson, M.E. and Li, C.-S.}
}
