@article{BeltránGracia:40903,
      author        = "Beltrán Gracia, José Antonio and Sánchez Gimeno, Ana
                       Cristina and Negueruela Suberviola, Ángel Ignacio and
                       Roncales Rabinal, Pedro and Abenoza Giménez, María",
      title         = "{}",
      year          = "2012",
}