@congreso_internacional{450,
  author = {Luis Martínez and Luis Gonzaga Pérez and Manuel José Barranco},
  title = {Incomplete preference relations to smooth out the cold start in Collaborative Recommender Systems},
  year = {2009},
  month = {June 14-17th},
  publisher = {The 28th North American Fuzzy Information Processing Society Annual Conference (NAFIPS2009)},
  address = {University of Cincinnati, Cincinnati, Ohio (USA)},
}