no. 2
A generalized plane wave metric
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 15 (1971) no. 2, pp. 169-175. 
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     author = {Patel, L. K. and Vaidya, P. C.},
     title = {A generalized plane wave metric},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {169--175},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {2},
     year = {1971},
     zbl = {0227.53024},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1971__15_2_169_0/}
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Patel, L. K.; Vaidya, P. C. A generalized plane wave metric. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 15 (1971) no. 2, pp. 169-175. http://archive.numdam.org/item/AIHPA_1971__15_2_169_0/

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[2] A. Peres, Some gravitational waves. Phys. Rev. let., t. 3, 1959, p. 571. | Zbl

[3] P.C. Vaidya and I.M. Pandya, Radiation: gravitational and electromagnetic. Curr. Sci., t. 29, 1960, p. 268.

[4] I.M. Pandya and P.C. Vaidya, Wave solutions in general relativity. I. Proc. nat. Sci. India, t. 27, 1961, p. 620. | MR | Zbl

[5] H. Takeno, On the space-time of Peres. Tensor, N. S., t. 11, 1961, p. 99. | MR | Zbl