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Recently S. Tanno has classified connected almostcontact Riemannian manifolds whose automorphism groups have themaximum dimension 9. In his classification table the almost contactRiemannian manifolds are divided into three classes: (1) homogeneousnormal contact Riemannian manifolds with constant 0-holomorphic sec-tional curvature if the sectional curvature for 2-planes which contain
Katsuei Kenmotsu (Sat,) studied this question.