The main sources of this chapter have been the reference grammars by Haeseryn et al. (1997), Paardekooper (1986) and a series of publications by Norbert Corver on the internal structure of the AP: Corver (1990/1994/1997a/1997b). For the morphological restriction on the formation of synthetic comparatives and superlatives, see De Haas & Trommelen (1993:286ff.) and Booij (2002: Section 2.3.1). Important sources for the discussion in Section 4.1.3 on comparative (sub)deletion and the categorial status of the elements als/dan that introduce the comparative phrase are Bennis (1977), Den Besten (1978), Hendriks (1995) and Corver (1990/1993). A more sophisticated discussion of the role of wh-movement in these constructions can be found in Section V11.3.5. Corver (2006) and Corver & Lechner (in prep) provide overviews of the syntactic and semantic literature on these issues and thus provide an excellent starting point for further investigation.