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Gath, Jakob; Mukhopadhyay, Ayan; Petkou, Anastasios C.; Petropoulos, P. Marios; Siampos, Konstadinos (2015). Petrov classification and holographic reconstruction of spacetime. Journal of High Energy Physics, 2015(9), pp. 1-21. Springer 10.1007/JHEP09(2015)005