@article {Cerdeira1996,
	title = {On the characterization of axial maps},
	journal = {Environment and Planning B: Planning and Design},
	volume = {23},
	number = {6},
	year = {1996},
	note = {n/a},
	pages = {771-780},
	abstract = {n/a},
	author = {Cerdeira, J.O. and Cordovil, R. and Heitor, T.V.}
}
