@ARTICLE{2009-UMUAI-Romero,
  AUTHOR = {Garcia, E. and Romero, C. and Ventura, S. and De Castro, C.},
  TITLE = {An architecture for making recommendations to courseware authors using association rule mining and collaborative filtering},
  JOURNAL = {User Modeling and User-Adapted Interaction},
  VOLUME = {19},
  NUMBER = {1-2},
  YEAR = {2009},
  PAGES = {99-132}
}