1. Bennett, B., Cohn, A. G., Torrini, P., and Hazarika, S. M.: 2000, Region-based Qualitative, Technical Report, School of Computing, University of Leeds.
2. Bennett, B., Cohn, A. G., Torrini, P., Hazarika, S. M.: 2000, A foundation for region-based qualitative geometry, in W. Horn (ed.), Proceedings of ecai-2000, pp. 204–208.
3. Clarke, B. L.: 1981, A calculus of individuals based on ‘connection’, Notre Dame Journal of Formal Logic 23(3), 204–218.
4. Clarke, B. L.: 1985, Individuals and points, Notre Dame Journal of Formal Logic 26(1), 61–75.
5. Cohn, A. G.: 1993, Modal and non modal qualitative spatial logics, in F. D. Anger, H. W. Guesgen, and J. van Benthem (eds.), Proceedings of the Workshop on Spatial and Temporal Reasoning, Chambéry, IJCAI.