@article{article9f98fbf0,
title   = {Quasinormal modes in a time-dependent black hole background},
author = {Shao, Cheng-Gang and Wang, Bin and Abdalla, Élcio and Su, Ru-Keng},
year = {2005},
doi = {10.1103/physrevd.71.044003},
journal   = {Physical Review D}
}