@article {1236,
	title = {Polyspermophyllum, a New Permian Gymnosperm form Argentina, with Considerations about the Dicranophyllales},
	journal = {Review of Palaeobotany and Palynology},
	volume = {63},
	year = {1990},
	pages = {117-135},
	chapter = {117},
	author = {Archangelsky, Sergio and C{\'u}neo, Rub{\'e}n}
}
@article {514,
	title = {Aspects of Permian Palaeobotany and Palynology. IX. Conifer-dominated Rotliegend floras from the Saar-Nahe basin (?Late carboniferous-early permian; SW-Germany) with special reference to the reproductive biology of early conifers },
	journal = {Review of Palaeobotany and Palynology},
	volume = {62},
	year = {1990},
	pages = {205-248},
	chapter = {205},
	doi = {10.1016/0034-6667(90)90090-6 },
	author = {Kerp, J.H.F. and Poort, R.J. and Swinkels, h.A.J.M. and Verwer, R.}
}
