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Nicolai, H., Peeters, K. (2007). Loop and Spin Foam Quantum Gravity: A Brief Guide for Beginners. In: Stamatescu, IO., Seiler, E. (eds) Approaches to Fundamental Physics. Lecture Notes in Physics, vol 721. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71117-9_9
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