MathSciNet bibliographic data MR2015045 53D30 (57R19) Bradlow, Steven B.; García-Prada, Oscar; Gothen, Peter B. Surface group representations and ${\rm U}(p,q)$${\rm U}(p,q)$-Higgs bundles. J. Differential Geom. 64 (2003), no. 1, 111–170. Article

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