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\bibitem{2268} Isabel Guitart, Jordi Conesa, Luis Villarejo, Agata Lapedriza, David Masip, Antoni Perez, et al. (2013). Opinion Mining on Educational Resources at the Open University of Catalonia. In \textit{3rd International Workshop on Adaptive Learning via Interactive, Collaborative and Emotional approaches. In conjunction with CISIS 2013: The 7th International Conference on Complex, Intelligent, and Software Intensive Systems} (pp. 385--390).

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