%0 Journal Article %A Angelopoulos, E. %T On unitary irreducible representations of semidirect products with nilpotent normal subgroup %J Annales de l'institut Henri Poincaré. Section A, Physique Théorique %D 1973 %P 39-55 %V 18 %N 1 %I Gauthier-Villars %U http://www.numdam.org/item/AIHPA_1973__18_1_39_0/ %G en %F AIHPA_1973__18_1_39_0