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\bibitem{978} Matthias S. Keil, Agata Lapedriza, David Masip, \& Jordi Vitria. (2008). Preferred Spatial Frequencies for Human Face Processing Are Associated with Optimal Class Discrimination in the Machine. \textit{PLoS ONE 3(7):e2590, DOI:10.1371/journal.pone.0002590}.

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