3-submersions from QR-hypersurfaces of quaternionic Kaehler manifolds
  In this paper we study 3-submersions from a QR-hypersurface of a quaternionic Kaehler manifold onto an almost quaternionic hermitian manifold. We also prove the non-existence of quaternionic submersions between quaternionic Kaehler manifolds which are not locally hyper-Kaehler. 
Gabriel Eduard Vilcu
math.DG