E. Frenkel, Lectures on the Langlands Program and Conformal Field
Theory, hep-th/0512172.
E. Frenkel, Recent
Advances in the Langlands Program, Bull. Amer. Math. Soc.
41 (2004), 151-184, Journal
article.
E. Frenkel, Affine
Algebras, Langlands Duality and Bethe Ansatz, XIth International
Congress of Mathematical Physics (Paris, 1994), 606--642,
Internat. Press, Cambridge, MA, 1995, q-alg/9506003.