The Folland–Stein spectrum of some Heisenberg Bieberbach manifolds. To appear in Kyushu Journal of Mathematics. [arXiv:2402.15093]
(with Yuya Takeuchi) Joint spectrum of the sub-Laplacian and the Reeb vector field on three-dimensional Heisenberg Bieberbach manifolds, preprint. [arXiv.2608.03265]