Schutz, Bernard F. Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society; External Organizations;
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Andersson, N., Araujo, M. E., & Schutz, B. F. (1993). The phase-integral method and black hole normal modes. Classical and quantum gravity, 10(4), 735-755. doi:10.1088/0264-9381/10/4/009.