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http://journals.cambridge.org/action/displayAbstract?aid=311285
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Tyler J. Jarvis,
Ralph Kaufmann
and Takashi Kimura
(2005).
Pointed admissible G-covers and G-equivariant cohomological field theories. Compositio Mathematica, 141
,
pp 926-978
doi:10.1112/S0010437X05001284