@inproceedings(1997-slot-unification-grammar,
  author = {A.Ferrández and M.Palomar and Lidia Ana Moreno Boronat},
  title = {Slot Unification Grammar},
  year = {1997},
  booktitle = {Joint Conference on Declarative Programming (APPIA-GULP-PRODE) (Formerly GULP-PRODE and formerly PRODE)},
  address = {Grado, Italia},
  pages = {523-532}
)