Instability of the charged massive scalar field on the Kerr–Newman black hole spacetime H. S. Vieira, V. B. Bezerra and C. R. Muniz Eur. Phys. J. C, 82 10 (2022) 932 Published online: 20 October 2022 DOI: 10.1140/epjc/s10052-022-10908-7