A spectrum generating nilpotent group for the relativistic free particle
Annales de l'I.H.P. Physique théorique, Volume 13 (1970) no. 2, p. 129-136
@article{AIHPA_1970__13_2_129_0,
author = {Tilgner, Hans},
title = {A spectrum generating nilpotent group for the relativistic free particle},
journal = {Annales de l'I.H.P. Physique th\'eorique},
publisher = {Gauthier-Villars},
volume = {13},
number = {2},
year = {1970},
pages = {129-136},
mrnumber = {286389},
language = {en},
url = {http://www.numdam.org/item/AIHPA_1970__13_2_129_0}
}

Tilgner, Hans. A spectrum generating nilpotent group for the relativistic free particle. Annales de l'I.H.P. Physique théorique, Volume 13 (1970) no. 2, pp. 129-136. http://www.numdam.org/item/AIHPA_1970__13_2_129_0/

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[3] C.-M. Edwards et J. Lewis, Twisted Group Algebras. I. Commun. math. Phys. , t. 13, 1969, p. 119-130. | MR 253064 | Zbl 0175.44502