Null electromagnetic fields in algebraically special Petrov type spaces
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 9 (1968) no. 3, pp. 273-281. 
@article{AIHPA_1968__9_3_273_0,
     author = {Kichenassamy, S.},
     title = {Null electromagnetic fields in algebraically special {Petrov} type spaces},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {273--281},
     publisher = {Gauthier-Villars},
     volume = {9},
     number = {3},
     year = {1968},
     mrnumber = {245292},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1968__9_3_273_0/}
}
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Kichenassamy, S. Null electromagnetic fields in algebraically special Petrov type spaces. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 9 (1968) no. 3, pp. 273-281. http://www.numdam.org/item/AIHPA_1968__9_3_273_0/

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[4] S. Kichenassamy, C. R. Acad. Sci. Paris, t. 266 A, 1968, p. 509. | MR