no. 1
On unitary irreducible representations of semidirect products with nilpotent normal subgroup
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 18 (1973) no. 1, pp. 39-55 
@article{AIHPA_1973__18_1_39_0,
     author = {Angelopoulos, E.},
     title = {On unitary irreducible representations of semidirect products with nilpotent normal subgroup},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {39--55},
     year = {1973},
     publisher = {Gauthier-Villars},
     volume = {18},
     number = {1},
     mrnumber = {335682},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1973__18_1_39_0/}
}
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Angelopoulos, E. On unitary irreducible representations of semidirect products with nilpotent normal subgroup. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 18 (1973) no. 1, pp. 39-55. https://www.numdam.org/item/AIHPA_1973__18_1_39_0/

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