1. Alchourrón, Carlos E. and David Makinson: 1981, ?Hierarchies of regulations and their logic?, in R. Hilpinen (ed.),New Studies in Deontic Logic, D. Reidel, Dordrecht, pp. 125?148.
2. Alchourrón, Carlos E. and David Makinson: 1982, ?On the logic of theory change: contraction functions and their associated revision functions?,Theoria 48, 14?37.
3. Alchourrón, Carlos E., Peter Gärdenfors and David Makinson: ?On the logic of theory change: partial meet contraction and revision functions?, forthcoming.
4. Alchourrón, Carlos E. and David Makinson: ?On the logic of theory change: safe contraction and revision functions?, forthcoming.
5. Gärdenfors, Peter: 1979, ?Conditionals and changes of belief?, in I. Niiniluoto and R. Tuomela (eds.),The Logic and Epistemology of Scientific Change, Acta Philosophica Fennica 30, 1978, issues 2?4, North-Holland, Amsterdam.