Schutz, Bernard F. Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
schutz_60517.pdf (Any fulltext), 9MB
Schutz, B. F., & Friedman, J. L. (1975). On the Stability of Relativistic Systems. The Astrophysical Journal, 200, 204-220. doi:10.1086/153778.