no. 1
On the theory of unitary representations of the SL(2,C) group
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 6 (1967) no. 1, pp. 17-37. 
@article{AIHPA_1967__6_1_17_0,
     author = {Dao Vong Duc and Nguyen Van Hieu},
     title = {On the theory of unitary representations of the $SL(2, C)$ group},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {17--37},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {1},
     year = {1967},
     mrnumber = {213473},
     zbl = {0161.23702},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1967__6_1_17_0/}
}
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Dao Vong Duc; Nguyen Van Hieu. On the theory of unitary representations of the $SL(2, C)$ group. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 6 (1967) no. 1, pp. 17-37. http://www.numdam.org/item/AIHPA_1967__6_1_17_0/

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