Ehlers, Jürgen Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Encycl2108.pdf (Publisher version), 111KB
Ehlers, J. (2001). General Relativity and Gravitation. In Encyclopedia of Astronomy and Astrophysics Vol.2 (pp. 966-971). London: Macmillan Publishers Ltd.