Montero, Pedro J. Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Mewes, V., Font, J. A., & Montero, P. J. (2015). Measuring the black hole spin direction in 3D Cartesian numerical relativity simulations. Physical Review D, 91(12): 124043. doi:10.1103/PhysRevD.91.124043.