@article{billhardt-et-al_ijufks2003,
  author       = {Billhardt, Holger and Borrajo, Daniel and Maojo, Victor},
  journal      = {International Journal of Uncertainty, Fuzziness and Knowldege-Based
    Systems},
  number       = 1,
  pages        = {87 -- 113},
  title        = {Learning retrieval expert combinations with genetic algorithms},
  volume       = 11,
  year         = 2003,
}