1. S. Weinberg, Ultraviolet divergences in quantum theories of gravitation, in General Relativity: An Einstein Centenary Survey, ed. by S.W. Hawking, W. Israel, (Cambridge University Press, Cambridge, 1979), p. 790
2. C. Wetterich, Exact evolution equation for the effective potential. Phys. Lett. B301, 90 (1993). arXiv:1710.05815 [hep-th]
3. M. Reuter, Nonperturbative evolution equation for quantum gravity. Phys. Rev. D57, 971 (1998). arXiv:hep-th/9605030
4. W. Souma, Nontrivial ultraviolet fixed point in quantum gravity. Prog. Theor. Phys. 102, 181 (1999). arXiv:hep-th/9907027 [hep-th]
5. R. Percacci, An introduction to covariant quantum gravity and asymptotic safety, in 100 Years of General Relativity, vol. 3 (World Scientific, Singapore, 2017)