no. 1
Gravitational radiation and the arrow of time in cosmology
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 5 (1966) no. 1, pp. 77-81 
@article{AIHPA_1966__5_1_77_0,
     author = {Krishna Rao, J. and Vaidya, P. C.},
     title = {Gravitational radiation and the arrow of time in cosmology},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {77--81},
     year = {1966},
     publisher = {Gauthier-Villars},
     volume = {5},
     number = {1},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1966__5_1_77_0/}
}
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Krishna Rao, J.; Vaidya, P. C. Gravitational radiation and the arrow of time in cosmology. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 5 (1966) no. 1, pp. 77-81. https://www.numdam.org/item/AIHPA_1966__5_1_77_0/

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