MATHEMATICAL REPORTS, cilt.16, sa.2, ss.207-217, 2014 (SCI-Expanded)
The object of the present paper is to study xi-concircularly flat and phi-concircularly flat N(k)-contact metric manifolds. Beside these, we also study N(k)-contact metric manifolds satisfying Z(xi, X).S = 0. Finally, we construct an example to verify some results.