Quaternionic Kahler manifolds of cohomogeneity one by Dancer, A, Swann, A

Hyperkähler and quaternionic Kähler geometry by Swann, A

“…</p> <p>HyperKähler metrics are constructed on the fundamental quaternionic line bundle (with the zero-section removed) of a quaternionic Kähler manifold (indefinite if the scalar curvature is negative). …”

Hypertoric manifolds and hyperKähler moment maps by Dancer, A, Swann, A

“…In particular, we classify complete hyperKähler manifolds of dimension 4n with a tri-Hamiltonian action of a torus of dimension n, without any assumption on the finiteness of the Betti numbers. …”

Metric geometries over the split quaternions by Dancer, A, Jørgensen, H, Swann, A

“…In particular, we discuss the twistor spaces and Swann bundles of para-quaternionic Kähler manifolds. These are used to classify examples with a fully homogeneous action of a semi-simple Lie group, and to construct distinct para-quaternionic Kähler metrics from indefinite real analytic conformal manifolds. …”