@inbook {553,
	title = {Gymnospermophyta},
	booktitle = {The fossil record 2},
	year = {1993},
	pages = {795-808},
	publisher = {Chapman \& Hall},
	organization = {Chapman \& Hall},
	address = {London},
	author = {Cleal, Chris J.},
	editor = {Benton, M.J.}
}
