Jürgen, Ehlers Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Pössel, Markus Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Jürgen, E., & Pössel, M. (2001). Neuere Entwicklungen der relativistischen Physik. In M. Pössel (Ed.), Die Relativitätstheorie Einsteins. (pp. 325-470). Berlin: Springer.