Loll, Renate Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
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Ambjörn, J., Nielsen, J. L., Rolf, J., & Loll, R. (1999). Euclidean and Lorentzian quantum gravity - lessons from two dimensions. Chaos, Solitons and Fractals, 10(2-3), 177-195. doi:10.1016/S0960-0779(98)00197-0.