@article {1344,
	title = {The Callistophytales (Pteridospermopsida): reproductively sophisticated paleozoic gymnosperms},
	journal = {Review of Palaeobotany and Palynology},
	volume = {32},
	year = {1981},
	pages = {103-121},
	chapter = {103},
	author = {Rothwell, Gar W.}
}
