@article {520,
	title = {Structure and relationships of primitive conifers},
	journal = {Neues Jahrbuch f{\"u}r Geologie und Pal{\"a}ontologie Abhandlungen},
	volume = {183},
	year = {1991},
	month = {11/1991},
	pages = {269-287},
	chapter = {269},
	author = {Mapes, Gene and Rothwell, Gar W.}
}
