References
- Lecture Notes in Mathematics v.1598 Generalized Heisenberg groups Damek-Ricci harmonic extensions J. Berndt;F. Tricerri;L. Vanhecke
- Ann. Sci. Ecole Norm. Sup. v.27 no.5 Geometry of 2-step nilpotent groups with a left invariant metric P. Eberlein https://doi.org/10.24033/asens.1702
- Geom. Dedicata v.11 no.2 Riemannian nilmanifolds attached to Clifford modules A. Kaplan
- Bull. London Math. Soc. v.15 no.1 On the geometry of groups of Heisenberg type A. Kaplan https://doi.org/10.1112/blms/15.1.35
- Ergebnisse der Mathematik und ihrer Grenzgebiete v.68 Discrete subgroups of Lie groups M. S. Raghunathan