1. D. Arinkin, Appendix to [DP1].
2. Adv. Soviet Math.;A Beilinson,1993
3. A. Beilinson, V. Drinfeld, Quantization of Hitchin Hamiltonians and Hecke eigensheaves, preprint, available at http://www.math.uchicago.edu/~mitya .
4. D. Ben-Zvi, J. Francis, D. Nadler, Integral transforms and Drinfeld centers in derived algebraic geometry, arXiv:0805.0157.
5. D. Ben-Zvi, T. Nevins, Cusps and $\mathcal{D} $ -modules, J. Amer. Math. Soc. 17 (2004), 155–179.