Publisher
Springer Nature Singapore
Reference33 articles.
1. H. Andréasson, Living Rev. Relativ. 14, 4 (2011). https://doi.org/10.12942/lrr-2011-4
2. A. Ashtekar, B. Krishnan, Phys. Rev. Lett. 89, 261101 (2002). arXiv:gr-qc/0207080
3. L. Bel, C. R. Acad. Sci. 247, 1094 (1958)
4. L. Bel, C.R. Acad. Sci. 248, 1297 (1959)
5. L. Bel, Cah. Phys. 138, 59 (1962)