1. Abney, Steven: 1987, The English Noun Phrase in its Sentential Aspect, Ph.D. Dissertation, MIT.
2. Akmajian, Adrian, Steele, Susan, and Wasow, Thomas: 1979, ‘The category AUX in universal grammar’, Linguistic Inquiry 10, 1–64.
3. Barton, Ellen: 1985, A Theory of Constituent Structures and Constituent Utterances, Ph.D. Dissertation, Northwestern University.
4. Barton, Ellen: 1989a, ‘Autonomy and modularity in a pragmatic model’, CLS Parasession on Language in Context 1–14.
5. Barton, Ellen: 1989b, ‘Xmax as the initial node of generative grammar’, WECOL 1, 1–15.