We study 3-submersions from a QR-hypersurface of a quaternionic Kähler manifold onto an almost quaternionic hermitian manifold. We also prove the non-existence of quaternionic submersions between quaternionic Kähler manifolds which are not locally hyper-Kähler.
Department of Mathematics and Computer Science, Petroleum-Gas University of Ploieşti, Bulevardul Bucureşti 39, Ploieşti 100680, Romania
Research Center in Geometry, Topology and Algebra, Faculty of Mathematics and Computer Science, University of Bucureşti, Str. Academiei 14, Bucureşti 70109, Romania