Rendall, Alan D. Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
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Rendall, A. D. (1997). Existence of constant mean curvature foliations in spacetimes with two-dimensional local symmetry. Communications in Mathematical Physics, 189(1), 145-164. doi:10.1007/s002200050194.