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    On ?-Biminimal Conformal İmmersions
    (Hacettepe Üniversitesi, 2021) Karaca, Fatma; Özgür, Cihan
    In the present paper, we consider lambda-biminimal conformal immersions. We find the Euler-Lagrange equation of lambda-biminimal immersions under conformal change of metrics. We also consider lambda-biminimal immersions from a surface (M-2, g) to a Riemannian manifold (N-3, h) under homothetic change of metric and give an example.
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    On Quasi-Einstein Sequential Warped Product Manifolds
    (Elsevier [Commercial Publisher], 2021) Karaca, Fatma; Özgür, Cihan
    We find the necessary and sufficient conditions for a sequential warped product manifold to be a quasi-Einstein manifold. We also investigate the necessary conditions for a sequential standard static space-time and a sequential generalized Robertson-Walker space-time to be a manifold of quasi-constant curvature.