@article{hristidis_koudas_papakonstantinou_2001, 
  title={PREFER}, 
  volume={30}, 
  DOI={10.1145/376284.375690}, 
  publisher={Association for Computing Machinery (ACM)}, 
  author={Hristidis and Koudas and Papakonstantinou}, 
  year={2001}, 
  month={Jun}
  }