Blandford–Znajek mechanism in black holes in alternative theories of gravity Guancheng Pei, Sourabh Nampalliwar, Cosimo Bambi and Matthew J. Middleton Eur. Phys. J. C, 76 10 (2016) 534 Published online: 29 September 2016 DOI: 10.1140/epjc/s10052-016-4387-z