Ortaggio, Marcello (2009). "Bel–Debever criteria for the classification of the Weyl tensor in higher dimensions". Classical and Quantum Gravity. arXiv:0906.3818. doi:10.1088/0264-9381/26/19/195015.
doi.org
Ortaggio, Marcello (2009). "Bel–Debever criteria for the classification of the Weyl tensor in higher dimensions". Classical and Quantum Gravity. arXiv:0906.3818. doi:10.1088/0264-9381/26/19/195015.