82 INDEX quaternionic pluriharmonic, 50 quaternionic regular, 48 quaternionic-K¨ ahler manifold, 34 Reeb vector fields, 10 QC vector field, 67 Ricci 2-forms ρi, 18 Ricci-type tensors, 18 standard 3-contact form ˜ 39 sub-Laplacian, 37 torsion endomorphism T ξ , 11 umbilical hypersurface, 34 vertical space V , 10 integrable, 73 volume form V olη, 71
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