MathSciNet bibliographic data MR2286073 (2007m:17031) 17B65 (17B05) Benkart, Georgia; Terwilliger, Paul The universal central extension of the three-point \$\germ{sl}\sb 2\$$\germ{sl}\sb 2$ loop algebra. Proc. Amer. Math. Soc. 135 (2007), no. 6, 1659–1668. Article

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