@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}, volume = {13}, year = {1970}, pages = {129-136}, mrnumber = {286389}, language = {en}, url = {http://dml.mathdoc.fr/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, Tome 13 (1970) pp. 129-136. http://gdmltest.u-ga.fr/item/AIHPA_1970__13_2_129_0/
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