MathSciNet bibliographic data MR1896177 20G15 (19C09) Brylinski, Jean-Luc; Deligne, Pierre Central extensions of reductive groups by \$\bold K\sb 2\$$\bold K\sb 2$. Publ. Math. Inst. Hautes Études Sci. No. 94 (2001), 5–85. Article

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