Ehlers, Jürgen 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;
Ehlers, J., & Pössel, M. (2003). Max Born: Die Relativitätstheorie Einsteins (7). Berlin u.a.: Springer.