@article {aNunes00,
	title = {A contour-based approach to binary shape coding using a multiple grid chain code},
	journal = {Signal processing: image communication},
	volume = {15},
	number = {7-8},
	year = {2000},
	pages = {585{\textendash}599},
	issn = {0923-5965},
	author = {Nunes, P. and Marqu{\'e}s, F. and Pereira, F. and Gasull, A.}
}
