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The definition of conformal field theory , preprint, 1988; also in: Topology, geometry and quantum field theory , ed. U. Tillmann, London Math. Soc. Lect. Note Ser., Vol. 308. Cambridge University Press, Cambridge (2004) 421-577.

Ib Madsen, section 2.2 of Moduli spaces from a topological viewpoint, Proceedings of the International Congress of Mathematics, Madrid 2006 (2007) (pdf)

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