Analytical calculation of Kerr and Kerr-Ads black holes in f(R) theoryPing Li, Yong-qiang Liu, Jiang-he Yang, Siwei Xu and Xiang-hua ZhaiEur. Phys. J. C, 84 7 (2024) 704DOI: https://doi.org/10.1140/epjc/s10052-024-13074-0