@article {1492,
	title = {Paleozoic conifers},
	journal = {Proceedings of the International Congres of Plant Sciences},
	volume = {1},
	year = {1927},
	pages = {401-411},
	chapter = {401},
	author = {Florin, Rudolf}
}
@article {607,
	title = {Eenige opmerkingen betreffende de Palaeozoische flora van Djambi, Sumatra},
	journal = {Verslag gewone vergadering Afdeling Natuurkunde KNAW },
	volume = {36},
	year = {1927},
	pages = {1-7},
	chapter = {1},
	author = {Posthumus, O.}
}
@article {579,
	title = {Palaeozoic plants from Central Shansi},
	journal = {Palaeontologia Sinica Series A},
	volume = {2},
	year = {1927},
	pages = {1-316},
	chapter = {1},
	author = {Halle, T.G.}
}
