@book{
    gro:val:96:ed,
    editor = "Grover, Claire and Vallduví, Enric",
    publisher = "Centre for Cognitive Science, University of Edinburgh",
    title = "Studies in {HPSG}",
    series = "Edinburgh Working Papers in Cognitive Science",
    booktitle = "Studies in {HPSG}",
    volume = "12",
    year = "1996"
}