({\kappa},{\mu},\u{psion}=const.)-Contact Metric Manifolds With   {\xi}(I_{M})=0
  We give a local classification of ({\kappa},{\mu},\u{psion}=const.)-contact metric manifold (M,{\phi},{\xi},{\eta},g) with {\kappa}<1 which satisfies the condition" the Boeckx invariant function I_{M}=((1-({\mu}/2))/(\surd(1-{\kappa}))) is constant along the integral curves of the characteristic vector field {\xi}". 
\.Irem K\"upeli Erken and Cengizhan Murathan
math.DG