Ehlers, Jürgen Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
pramana69_7.pdf (Publisher version), 116KB
Ehlers, J. (2007). A K Raychaudhuri and his equation. Pramana-Journal of Physics, 69(1), 7-14. doi:10.1007/s12043-007-0106-5.