Friedrich, Helmut Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
2745.pdf (Preprint), 459KB
Friedrich, H., & Kannar, J. (2000). Bondi-type systems near space-like infinity and the calculation of the NP-constants. Journal of Mathematical Physics, 41, 2195-2232.