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\bibitem{698} Miquel Ferrer, Ernest Valveny and F. Serratosa. 2006. Spectral Median Graphs Applied to Graphical Symbol Recognition. \textit{11th Iberoamerican Congress on Pattern Recognition (CIARP{\textasciiacute}06), J.P. Martinez{\textendash}Trinidad et al. (Eds.), LNCS 4225: 774{\textendash}783}.

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