The angular momentum of plane-fronted gravitational waves in the   teleparallel equivalent of general relativity
  We present a simplified expression for the gravitational angular momentum in the framework of the teleparallel equivalent of general relativity (TEGR). The expression arises from the constraints equations of the Hamiltonian formulation of the TEGR. We apply this expression to the calculation of the angular momentum of plane-fronted gravitational waves in an arbitrary three-dimensional volume $V$ of space and compare the results with those obtained for linearised gravitational waves. 
J. F. da Rocha Neto and J. W. Maluf
gr-qc