@article{DBLP:journals/te/ValdiviaNO09,
  author    = {Ricardo Valdivia and
               Miguel Nussbaum and
               Sergio F. Ochoa},
  title     = {Modeling a Collaborative Answer Negotiation Activity Using
               IMS-Based Learning Design},
  journal   = {IEEE Trans. Education},
  volume    = {52},
  number    = {3},
  year      = {2009},
  pages     = {375-384},
  ee        = {http://dx.doi.org/10.1109/TE.2008.930089},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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