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\bibitem{Graf2006} Graf, S., Viola, S.R., Kinshuk, \& Leo, T. (2006). Representative Characteristics of Felder-Silverman Learning Styles: An Empirical Model. In \textit{Proceedings of the International Conference on Cognition and Exploratory Learning in Digital Age} (pp. 235--242). Barcelona, Spain: Proceedings of the IADIS International Conference on Cognition and Exploratory Learning in Digital Age (CELDA 2006).

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