no. 2
The irreducible ray representations of the full inhomogeneous Galilei group
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 2, pp. 137-161. 
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     author = {Brennich, R. H.},
     title = {The irreducible ray representations of the full inhomogeneous {Galilei} group},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {137--161},
     publisher = {Gauthier-Villars},
     volume = {13},
     number = {2},
     year = {1970},
     mrnumber = {275770},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1970__13_2_137_0/}
}
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Brennich, R. H. The irreducible ray representations of the full inhomogeneous Galilei group. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 2, pp. 137-161. http://www.numdam.org/item/AIHPA_1970__13_2_137_0/

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