@inproceedings {EFH+06,
  month = may,
  title = {A Proposal for the cooperation of solvers in constraint functional logic programming},
  year = 2006,
  booktitle = {Paqui Luci, (Ed.). VI Jornadas sobre Programaci\'{o}n y Lenguajes. Sitges, 4 al 6 de Octubre},
  author = {Sonia Est\'{e}vez and Antonio J. Fern\'{a}ndez and Teresa Hortal\'{a} Gonz\'{a}lez and Mario Rodr\'{\i}guez 
  and Fernando S\'{a}enz P\'{e}rez and Rafael del Vado-V\'{\i}rseda}
}