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 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).