Singular Poisson equations on Finsler-Hadamard manifolds
  In the first part of the paper we study the reflexivity of Sobolev spaces on non-compact and not necessarily reversible Finsler manifolds. Then, by using direct methods in the calculus of variations, we establish uniqueness, location and rigidity results for singular Poisson equations involving the Finsler-Laplace operator on Finsler-Hadamard manifolds having finite reversibility constant. 
Csaba Farkas, Alexandru Krist\'aly, Csaba Varga
math.AP