Pure radiation fields in general relativity
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 7 (1967) no. 3, pp. 245-247. 
@article{AIHPA_1967__7_3_245_0,
     author = {Misra, M.},
     title = {Pure radiation fields in general relativity},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {245--247},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {3},
     year = {1967},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1967__7_3_245_0/}
}
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Misra, M. Pure radiation fields in general relativity. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 7 (1967) no. 3, pp. 245-247. http://archive.numdam.org/item/AIHPA_1967__7_3_245_0/

[1] J. Ehlers, Gravitation. An Introduction to Current Research, edited by L. Witten (John Wiley and Sons Inc., New York, 1962), chapter 2. | MR | Zbl

[2] W.B. Bonnor, Z. Physik, t. 161, 1961, p. 439. | MR | Zbl

[3] M. Misra, J. Math. Phys., t. 7, 1966, p. 155.