Theisen, Stefan Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Lohmayer, R., Neuberger, H., Schwimmer, A., & Theisen, S. (2010). Numerical determination of entanglement entropy for a sphere. Physics Letters B, 685(2-3), 222-227. doi:10.1016/j.physletb.2010.01.053.