1. S. A. Arnal’ and A. N. Parshin, “On irreducible representations of discrete Heisenberg groups,” Mat. Zametki 92 (3), 323–330 (2012) [Math. Notes 92, 295–301 (2012)].
2. I. V. Beloshapka and S. O. Gorchinskiy, “Irreducible representations of finitely generated nilpotent groups,” Mat. Sb. 207 (1), 45–72 (2016) [Sb. Math. 207, 41–46 (2016)]; arXiv:math/1508.06808 [math.RT].
3. J. Bernstein, “Draft of: Representations of p-adic groups,” Lectures written by K.E. Rumelhart (Harvard Univ., 1992), http://wwwmathtauacil/~bernstei/Unpublished_texts/unpublished_texts/Bernstein93newharv. lectfrom-chicpdf
4. J. Dixmier, Les C -algèbres et leurs représentations (Gauthier-Villars, Paris, 1969).
5. P. Kahn, “Automorphisms of the discrete Heisenberg group,” Preprint (Cornell Univ., Ithaca, 2005), http://wwwmathcornelledu/m/sites/default/files/imported/People/Faculty/Heisenpdf