@article{222,
  author = {C. Romero and Pedro González García and S. Ventura and Maria José del Jesus Díaz and Francisco Herrera Triguero},
  title = {Evolutionary algorithms for subgroup discovery in e-learning: A practical application using Moodle data},
  year = {2009},
  journal = {Expert Systems with Applications},
  volume = {36},
  pages = {1632-1644},
}