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2. The semiclassical limit in loop quantum cosmology;Bojowald;Classical and Quantum Gravity,2001
3. Symmetries and Noether's theorems;Brading,2003
4. Callender, C., & Huggett, N. (2001). Introduction. Physics meets philosophy at the Plank scale: Contemporary theories in quantum gravity (pp. 1–23). Cambridge: Cambridge University Press.
5. World enough and space-time: Absolute vs. relational theories of space and time;Earman,1989