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[6] E. Witten, “(2+1)-Dimensional Gravity as an Exactly Soluble System,” Nucl. Phys. B311, 46 (1988).

[7] S. Deser, R. Jackiw and G. 't Hooft, “Three-Dimensional Einstein Gravity: Dynamics of Flat Space,” Annals Phys. 152, 220 (1984).

[8] M. Banados, C. Teitelboim and J. Zanelli, “The Black hole in three-dimensional spacetime,” Phys. Rev. Lett. 69, 1849 (1992) [hep-th/9204099].

[9] N. Dadhich, “Characterization of the Lovelock gravity by Bianchi derivative,” Pramana 74, 875 (2010) [arXiv:0802.3034 [gr-qc]].

[10] N. Dadhich and S. Jhingan, “The Lovelock gravity in the critical spacetime dimension,” arXiv:1202.4575 [gr-qc].