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\bibitem{Fraker1993} Fraker, C. F. (1993). The Four Humors in {\textquotedblleft}Celestina{\textquotedblright}. En I. A. Corfis, \& J. T. Snow (Eds.), \textit{Fernando de Rojas and {\textquotedblleft}Celestina{\textquotedblright}: Approaching the Fifth Centenary} (pp. 129--154). Madison: Hispanic Seminary of Medieval Studies.

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