Harry Frankfurt Alternate Possibilities and Moral Responsibility (this is also in Feinberg and Schafer-Landau Reason and Responsibility.)
Links to Readings
Harry Frankfurt Freedom of the Will and the Concept of a Person Journal of Philosophy 68 (1971)
Gary Watson 'Free Action and Free Will', Mind 96 (1987) (This is a survey article, but it also presents many orignal thoughts, and is not easy going.)
Robert Kane 'Two Kinds of Incompatibilism' Philosophy and Phenomenological Research 50 (1989)Randolph Clarke 'Toward a Credible Agent-Causal Account of Free Will' Nous 27 (1993)
For a (rather unsophisticated) defence of the idea that moral responsibility actually requires determinism, see W. Stace 'The Problem of Free Will' in Feinberg and Schafer-Landau.