Explicit solutions of $\square u=0$ on the Friedmann-Robertson-Walker space-times
Annales de l'I.H.P. Physique théorique, Volume 35 (1981) no. 4, p. 253-257
@article{AIHPA_1981__35_4_253_0,
author = {Klainerman, Sergi\u and Sarnak, Peter},
title = {Explicit solutions of $\square u = 0$ on the Friedmann-Robertson-Walker space-times},
journal = {Annales de l'I.H.P. Physique th\'eorique},
publisher = {Gauthier-Villars},
volume = {35},
number = {4},
year = {1981},
pages = {253-257},
zbl = {0499.58028},
mrnumber = {650132},
language = {en},
url = {http://www.numdam.org/item/AIHPA_1981__35_4_253_0}
}

Klainerman, S.; Sarnak, P. Explicit solutions of $\square u = 0$ on the Friedmann-Robertson-Walker space-times. Annales de l'I.H.P. Physique théorique, Volume 35 (1981) no. 4, pp. 253-257. http://www.numdam.org/item/AIHPA_1981__35_4_253_0/`

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