Abstract
We give the classification of the 3-dimensional contact metric manifolds satisfying ▽ξτ=0, which they have: harmonic curvature, or η-parralel Ricci tensor or cyclic η-parallel Ricci tensor.
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Gouli-Andreou, F., Xenos, P.J. On 3-dimensional contact metric manifolds with ▽ξτ=0. J Geom 62, 154–165 (1998). https://doi.org/10.1007/BF01237607
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DOI: https://doi.org/10.1007/BF01237607