Uniqueness of timelike killing vector fields
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 23 (1975) no. 3, pp. 297-301.
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     author = {Ihrig, E. and Sen, D. K.},
     title = {Uniqueness of timelike killing vector fields},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {297--301},
     publisher = {Gauthier-Villars},
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     number = {3},
     year = {1975},
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     url = {http://www.numdam.org/item/AIHPA_1975__23_3_297_0/}
}
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Ihrig, E.; Sen, D. K. Uniqueness of timelike killing vector fields. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 23 (1975) no. 3, pp. 297-301. http://www.numdam.org/item/AIHPA_1975__23_3_297_0/

[1] S. Kobayashi and K. Nomizu, Foundations of Differential Geometry, Vol. I, Interscience, 1963. | MR | Zbl

[2] L. Landau and E. Lifshitz, The Classical Theory of Fields, Pergamon, 1962. | MR | Zbl