Thiemann, Thomas Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
206354.pdf (Publisher version), 252KB
Thiemann, T. (1998). Quantum spin dynamics (QSD) VI: Quantum Poincaré Algebra and a Quantum Positivity of Energy Theorem for Canonical Quantum Gravity. Classical and Quantum Gravity, 15(6), 1463-1485.