Timothy Read Beatriz Barros Elena Bárcena Jesús Pancorbo Coalescing individual and collaborative learning to model user linguistic competences. 349-376 2006 16 User Model. User-Adapt. Interact. 3-4 http://dx.doi.org/10.1007/s11257-006-9014-5 db/journals/umuai/umuai16.html#ReadBBP06