1. Accentuate the Negative
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3. Beebee, H. (2004). Causing and nothingness. In J.Collins, N.Hall, & L. A.Paul (Eds.), Causation and counterfactuals (pp. 291–308). Cambridge, MA: MIT Press.
4. A Counterfactual Theory of Prevention and 'Causation' by Omission
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