@article{articlea5c30181,
title   = {A matrix method for quasinormal modes: Kerr and Kerr–Sen black holes},
author = {Lin, Kai and Qian, Wei-Liang and Pavan, Alan B and Abdalla, Elcio},
year = {2017},
doi = {10.1142/S0217732317501346},
journal   = {Modern Physics Letters A}
}