@book{91135,
	author = {Walker, Lawrence R. and Moral, Roger del, and ebrary, Inc.},
	title = {Primary succession and ecosystem rehabilitation},
	publisher = {Cambridge University Press,},
	year = {2003.},
	address = {Cambridge, UK ;},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10069842}
}