@article {234,
	title = {Mapping studies},
	year = {1973},
	pages = {pp.38-76},
	institution = {Athlone press},
	address = {London},
	author = {Hawksworth, D.L.},
	editor = {Ferry, B. W. and Baddeley, M.S. and Hawksworth, D. L.}
}
