On N ( k ) -quasi Einstein manifolds satisfying certain conditions. Özgür, Cihan; Sular, Sibel — 2008 Balkan Journal of Geometry and its Applications (BJGA)
Doubly warped product submanifolds of (κ,μ)-contact metric manifolds Sibel Sular; Cihan Özgür — 2011 Annales Polonici Mathematici We establish sharp inequalities for C-totally real doubly warped product submanifolds in (κ,μ)-contact space forms and in non-Sasakian (κ,μ)-contact metric manifolds.