@ARTICLE{2012-ES-QDM,
   author={Romero, C. and Zafra, A. and Luna, J. M. and Ventura, S.},
   title={Association rule mining using genetic programming to provide feedback to instructors from multiple-choice quiz data},
   journal={Expert Systems},
   volume = {30},
   number = {2},
   year={2013},
   pages={162-172},
}