Elliptic gamma functions, triptic curves and SL_3(Z)
  This is a condensed exposition of the results of math.QA/0601337, based on a talk of the first author at the Oberwolfach workshop "Deformations and Contractions in Mathematics and Physics", 15-21 January 2006. 
Giovanni Felder, Andre Henriques, Carlo A. Rossi and Chenchang Zhu