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added reference title and author, to make link-only answer more human-readable
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Look at http://arxiv.org/abs/math/0501398. (Opers, Beilinson and Drinfeld, 1993/2005)

Look at http://arxiv.org/abs/math/0501398 (Opers, Beilinson and Drinfeld, 1993/2005)

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Tony Pantev
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