Perverse sheaves on Artin stacks
  In this paper we develop the theory of perverse sheaves on Artin stacks continuing the study in "The six operations for sheaves on Artin stacks I: Finite Coefficients" and "The six operations for sheaves on Artin stacks II: Adic Coefficients" (math.AG/0512097 and math.AG/0603680) 
Yves Laszlo (CMLS), Martin Olsson (University of Texas at Austin)