@Article{romero07,
  author = {Romero, C. and Ventura, S.},
  title  = {Educational data mining: A survey from 1995 to 2005},
  journal = {Expert Syst. Appl.},
  year   = {2007},
  number = {1},
  url    = {http://portal.acm.org/citation.cfm?id=1223659},
  doi = {http://dx.doi.org/10.1016/j.eswa.2006.04.005},
  const  = {\ text}
}