1. Qualitative Reasoning about Physical Systems;Bobrow,1984
2. Order of magnitude reasoning;Raiman,1986
3. Order-of-magnitude reasoning with O[M];Mavrovouniotis;Artif. Intell. in Engng,1989
4. MINIMA. A symbolic approach to qualitative algebraic reasoning;Williams,1988
5. Representations of Commonsense Knowledge;Davis,1990