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\bibitem{951} Sergio Escalera, David M.J. Tax, Oriol Pujol, Petia Radeva, \& Robert P.W. Duin. (2008). Subclass Problem-Dependent Design for Error-Correcting Output Codes. \textit{IEEE Trans. on Pattern Analysis and Machine Intelligence,  vol.30(6):1041{\textendash}1054}.

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