1. Towards a paradigm shift in belief representation methodology;Barnden;Journal of Experimental and Theoretical Artificial Intelligence,1989
2. A theory of heuristics reasoning about uncertainty;Cohen;AI Magazine,1983
3. Upper and lower probabilities induced by a multivalued mapping;Dempster;Annals of Mathematical Statistics,1967
4. Using abstraction levels to integrate the tactics acquisition process in a problem-solving task;Doublait,1989