Elena Verdú, Luisa M. Regueras, María Jesús Verdú, Juan Pablo de Castro. Estimating the Difficulty Level of the Challenges Proposed in a Competitive e-Learning Environment. In Nicolás García-Pedrajas, Francisco Herrera, Colin Fyfe, José Manuel Benítez, Moonis Ali, editors, Trends in Applied Intelligent Systems - 23rd International Conference on Industrial Engineering and Other Applications of Applied Intelligent Systems, IEA/AIE 2010, Cordoba, Spain, June 1-4, 2010, Proceedings, Part I. Volume 6096 of Lecture Notes in Computer Science, pages 225-234, Springer, 2010. [doi]
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