Angular Momentum of the BTZ Black Hole in the Teleparallel Geometry
  We carry out the Hamiltonian formulation of the three- dimensional gravitational teleparallelism without imposing the time gauge condition, by rigorously performing the Legendre transform. Definition of the gravitational angular momentum arises by suitably interpreting the integral form of the constraint equation Gama^ik=0 as an angular momentum equation. The gravitational angular momentum is evaluated for the gravitational field of a rotating BTZ black hole. 
A. A. Sousa, R. B. Pereira and J. F. da Rocha-Neto