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"Estimating the Difficulty Level of the Challenges Proposed in a ..."
Elena Verdú et al. (2010)
- 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. IEA/AIE (1) 2010: 225-234

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