Bopp–Podolsky black holes and the no-hair theorem R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros, B. M. Pimentel and P. J. Pompeia Eur. Phys. J. C, 78 1 (2018) 43 Published online: 19 January 2018 DOI: 10.1140/epjc/s10052-018-5525-6