Affine Lie algebras at the critical level

• Adamovic, Drazen, Naihuan Jing, and Kailash C. Misra. “On Principal Realization of Modules for the Affine Lie Algebra $A_1 ^{(1)}$ at the Critical Level.” arXiv:1512.03160 [math], December 10, 2015. http://arxiv.org/abs/1512.03160.
• Fiebig, Peter. “Subquotient Categories of the Affine Category O at the Critical Level.” arXiv:1510.09131 [math], October 30, 2015. http://arxiv.org/abs/1510.09131.