1. Asher, N.: 1993, Reference to Abstract Objects in English: a Philosophical Semantics for Natural Language Metaphysics, Studies in Linguistics and Philosophy. Dordrecht: Kluwer.
2. Bohlin, P., R. Cooper, E. Engdahl, and S. Larsson: 1999, ‘Information states and dialogue move engines’. Gothenburg Papers in Computational Linguistics.
3. Carlson, L.: 1983, Dialogue Games, Synthese Language Library. Dordrecht: Reidel.
4. Chung, S., B. Ladusaw, and J. McCloskey: 1995, ‘Sluicing and Logical Form’. Natural Language Semantics 3: 239–282.
5. Cooper, R., S. Larsson, J. Hieronymus, S. Ericsson, E. Engdahl, and P. Ljunglof: 2001, ‘GODIS and Questions Under Discussion’. In: The TRINDI Book. Available from http://www.ling.gu.se/research/projects/trindi.