Tangent Bundles with Sasaki Metric and Almost Hypercomplex   Pseudo-Hermitian Structure
  The tangent bundle as a $4n$-manifold is equipped with an almost hypercomplex pseudo-Hermitian structure and it is characterized with respect to the relevant classifications. A number of 8-dimensional examples of the considered type of manifold are received from the known explicit examples in that manner. 
Mancho Manev