@inbook {556,
	title = {Morphology and phylogeny of Palaeozoic conifers},
	booktitle = {Origin and evolution of the Gymnosperms},
	year = {1988},
	pages = {298-337},
	publisher = {Columbia Univ. Press},
	organization = {Columbia Univ. Press},
	address = {New York},
	author = {Clement-Westerhof, Johanna A.},
	editor = {Beck, C.B.}
}
