Exact rotating black hole solutions for f(R) gravity by modified Newman Janis algorithm Pankaj Chaturvedi, Utkarsh Kumar, Udaykrishna Thattarampilly and Vishnu Kakkat Eur. Phys. J. C, 83 12 (2023) 1124 Published online: 12 December 2023 DOI: 10.1140/epjc/s10052-023-12306-z