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"In order to contribute nine to the central charge, the dimension of M must be six, and to ensure the additional condition of N = 2 supersymmetry, M must be a complex Kahler manifold."

Is there some paper that discusses the relationship between Kahler geometry and N=2 SUSY? This assertion does not seem trivial, although I'm not very well-versed in string theory or SUSY.

*http://arxiv.org/PS_cache/hep-th/pdf/9702/9702155v1.pdf (Page 9, 2nd paragraph)