Spectroscopy from the d-dimensional Reissner–Nordström black hole via adiabatic covariant action Hui-Ling Li and Rong Lin Eur. Phys. J. C, 73 2 (2013) 2316 Published online: 19 February 2013 DOI: 10.1140/epjc/s10052-013-2316-y