On the decomposition of the tensorial product of two representations of the Poincaré group - Case with at least one imaginary mass
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 2, pp. 163-194. 
@article{AIHPA_1970__13_2_163_0,
     author = {Bertrand, J.},
     title = {On the decomposition of the tensorial product of two representations of the {Poincar\'e} group - {Case} with at least one imaginary mass},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {163--194},
     publisher = {Gauthier-Villars},
     volume = {13},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1970__13_2_163_0/}
}
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Bertrand, J. On the decomposition of the tensorial product of two representations of the Poincaré group - Case with at least one imaginary mass. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 2, pp. 163-194. http://www.numdam.org/item/AIHPA_1970__13_2_163_0/

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