Schmidt, Bernd G. Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
lrr-1999-2Color.pdf (Publisher version), 901KB
Kokkotas, K. D., & Schmidt, B. G. (1999). Quasi-normal modes of stars and Black holes. Living Reviews in Relativity, lrr-1999-2. Retrieved from http://www.livingreviews.org.