@article{fernandez-et-al_ker2007,
  author       = {Fernández, Susana and Borrajo, Daniel and Fuentetaja, Raquel and Arias,
    Juan D. and Veloso, Manuela},
  journal      = {The Knowledge Engineering Review},
  number       = 2,
  pages        = {153 -- 184},
  title        = {PLTOOL: A knowledge engineering tool for planning and learning},
  volume       = 22,
  year         = 2007,
}