The authors present supersymmetric Chern-Simons terms for N>or=2 extended supergravity in d=3 dimensions and show that they are the gauge actions of N>or=2 conformal supergravity. In these models, gravitational and gauge Chern-Simons terms (which, when coupled to other systems, give rise to self-dual vectors and/or topological mass terms) are unified by supersymmetry.
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Roček et al. (1986) studied this question.