Alberto Sanfeliu René Alquézar J. Andrade Joan Climent Francesc Serratosa Jaume Vergés-Llahí Graph-based representations and techniques for image processing and image analysis. 639-650 2002 35 Pattern Recognition 3 http://dx.doi.org/10.1016/S0031-3203(01)00066-8 db/journals/pr/pr35.html#SanfeliuAACSV02