Does every theory have empirically equivalent rivals?

Barrow, J. D.: 1990, Theories of Everything, Oxford University Press, Oxford.

Boyd, R. N.: 1984, ?The Current Status of Scientific Realism?, in J.Leplin (ed.), Scientific Realism, University of California Press, Berkeley, pp. 41?82.

Churchland, P. M.: 1985, ?The Ontological Status of Observables: In Praise of Superempirical Virtues?, in P. M.Churchland and C. A.Hooker (eds.), Images of Science, University of Chicago Press, Chicago, pp. 35?47.

Dennett, D. C.: 1971, ?Intentional Systems?, Journal of Philosophy 68, 87?106.

Ellis, B.: 1985, ?What Science Aims To Do?, in P. M.Churchland and C. A.Hooker (eds.), Images of Science, University of Chicago Press, Chicago, pp. 48?74.

Friedman, M.: 1974, ?Explanation and Scientific Understanding?, Journal of Philosophy 71, 5?19.

Giere, R. N.: 1985, ?Constructive Realism?, in P. M.Churchland and C. A.Hooker (eds.), Images of Science, University of Chicago Press, Chicago, pp. 75?89.

Hoefer, C. and A.Rosenberg: 1994, ?Empirical Equivalence, Underdetermination, and Systems of the World?, Philosophy of Science 61, 592?607.

Horwich, P. G.: 1991, ?On the Nature and Norms of Theoretical Commitment?, Philosophy of Science 58, 1?14.

Kukla, A.: 1993, ?Laudan, Leplin, Empirical Equivalence, and Underdetermination?, Analysis 53, 1?7.

Kukla, A.: 1994, ?Non-Empirical Theoretical Virtues and the Argument from Underdetermination?, Erkenntnis 41, 157?170.

Kukla, A.: 1995, ?Is There a Logic of Incoherence??, International Studies in the Philosophy of Science 9, 57?69.

Langley, P., H.Simon, G.Bradshaw, and J.Zytkow: 1987, Scientific Discovery, MIT Press, Cambridge Massachusetts.

Laudan, L. and J.Leplin: 1991, ?Empirical Equivalence and Underdetermination?, Journal of Philosophy 88, 269?285.

Leplin, J: 1995, A Novel defense of Scientific Realism, unpublished manuscript, University of North Carolina, Greensboro, North Carolina.

Leplin, J. and L.Laudan: 1993, ?Determination Underdeterred?, Analysis, 53, 8?15.

McMichael, A.: 1985, ?Van Fraassen's Instrumentalism?, British Journal for the Philosophy of Science 36, 257?272.

Quine, W. V. O.: 1975, ?On Empirically Equivalent Systems of the World?, Erkenntnis 9, 313?328.

Salmon, W. C.: 1989, ?Four Decades of Scientific Explanation?, in P.Kitcher and W. C.Salmon (eds), Scientific Explanation: Minnesota Studies in the Philosophy of Science, Vol. 13, University of Minnesota Press, Minneapolis, pp. 3?219.

van Fraassen, B.: 1980, The Scientific Image, Clarendon Press, Oxford.

van Fraassen, B.: 1983, ?Glymour on Evidence and Explanation?, in J.Earman (ed.), Testing Scientific Theories: Minnesota Studies in the Philosophy of Science, Vol. 10, University of Minnesota Press, Minneapolis, pp. 165?176.