Cf. Hawking & Ellis 1973, sec. 7.1. - Hawking, Stephen W.; Ellis, George F. R. (1973). The large scale structure of space-time. Cambridge University Press. ISBN 0-521-09906-4.
Arnowitt, Deser & Misner 1962; for a pedagogical introduction, see Misner, Thorne & Wheeler 1973, §21.4–§21.7. - Arnowitt, Richard; Deser, Stanley; Misner, Charles W. (1962). "The dynamics of general relativity". In Witten, L. (ed.). Gravitation: An Introduction to Current Research. Wiley. pp. 227–265.
Fourès-Bruhat 1952 and Bruhat 1962; for a pedagogical introduction, see Wald 1984, ch. 10; an online review can be found in Reula 1998. - Fourès-Bruhat, Yvonne (1952). "Théoréme d'existence pour certains systémes d'équations aux derivées partielles non linéaires". Acta Mathematica. 88 (1): 141–225. Bibcode:1952AcMa...88..141F. doi:10.1007/BF02392131. https://doi.org/10.1007%2FBF02392131
See Gourgoulhon 2007. - Gourgoulhon, Eric (2007). 3+1 Formalism and Bases of Numerical Relativity. arXiv:gr-qc/0703035. Bibcode:2007gr.qc.....3035G. https://arxiv.org/abs/gr-qc/0703035
For a review of the basics of numerical relativity, including the problems alluded to here and further difficulties, see Lehner 2001. - Lehner, Luis (2001). "Numerical Relativity: A review". Class. Quantum Grav. 18 (17): R25 – R86. arXiv:gr-qc/0106072. Bibcode:2001CQGra..18R..25L. doi:10.1088/0264-9381/18/17/202. S2CID 9715975. https://arxiv.org/abs/gr-qc/0106072