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• Abbasi, M. T. K., Amri, N., Bejan, C. L., Conformal vector fields and Ricci soliton structures on natural Riemannian extensions, Mediterr. J. Math., 18(55) (2021), 1-16. https://doi.org/10.1007/s00009-020-01690-5
• Aslanci, S., Cakan, R., On a cotangent bundle with deformed Riemannian extension, Mediterr. J. Math., 11(4) (2014), 1251–1260. DOI 10.1007/s00009-013-0337-2
• Aslanci, S., Kazimova, S., Salimov, A. A, Some notes concerning Riemannian extensions, Ukrainian Math. J., 62(5) (2010), 661–675.
• Bejan, C. L., Eken, S¸., A characterization of the Riemann extension in terms of harmonicity, Czech. Math. J., 67(1) (2017), 197–206. DOI: 10.21136/CMJ.2017.0459-15
• Bejan, C. L., Kowalski, O., On some differential operators on natural Riemann extensions, Ann. Glob. Anal. Geom., 48 (2015), 171–180. DOI 10.1007/s10455-015-9463-3
• Bejan, C. L., Nakova, G., Amost para-Hermitian and almost paracontact metric structures induced by natural Riemann extensions, Resulth Math., 74(15) (2019). https://doi.org/10.1007/s00025-018-0939-x
• Bejan, C. L., Meriç, S¸. E., Kılıç, E., Einstein metrics induced by natural Riemann extensions, Adv. Appl. Clifford Algebras, 27(3) (2017), 2333–2343. DOI 10.1007/s00006-017-0774-2
• Bilen, L., Gezer, A., On metric connections with torsion on the cotangent bundle with modified Riemannian extension, J. Geom. 109(6) (2018), 1–17. https://doi.org/10.1007/s00022-018-0411-9
• Calvino-Louzao, E., Garcia-Rio, E., Gilkey, P., Vazquez-Lorenzo, A., The geometry of modified Riemannian extensions, Proc. R. Soc. Lond. Ser. A Math. Phys. Eng. Sci., 465 (2107) (2009), 2023-2040. https://www.jstor.org/stable/30245448
• Dryuma, V., The Riemannian extension in theory of differential equations and their application, Mat. Fiz. Anal. Geom., 10(3) (2003), 307–325.
• Gezer, A., Bilen, L., Cakmak, A., Properties of modified Riemannian extensions, Zh. Mat. Fiz. Anal. Geom., 11(2) (2015), 159-173. https://doi.org/10.15407/mag11.02.159
• Kowalski, O., Sekizawa, M., On natural Riemann extensions, Publ. Math. Debr., 78(3–4) (2011), 709-721. DOI: 10.5486/PMD.2011.4992
• Kowalski, O., Sekizawa, M., Almost Osserman structures on natural Riemann extensions, Differ. Geom. Appl., 31 (2013), 140-149. https://doi.org/10.1016/j.difgeo.2012.10.007
• Ocak, F., Notes about a new metric on the cotangent bundle, Int. Electron. J. Geom., 12(2) (2019), 241–249.
• Ocak, F., Some properties of the Riemannian extensions, Konuralp J. of Math., 7(2) (2019), 359–362.
• Ocak, F., Some notes on Riemannian extensions, Balkan J. Geom. Appl., 24(1) (2019), 45–50.
• Ocak, F., Kazimova, S., On a new metric in the cotangent bundle, Transactions of NAS of Azerbaijan Series of Physical-Technical and Mathematical Sciences, 38(1) (2018), 128—138.
• Patterson, E. M., Walker, A. G., Riemannian extensions, Quant. Jour. Math., 3 (1952), 19–28.
• Salimov, A., Cakan, R., On deformed Riemannian extensions associated with twin Norden metrics, Chinese Annals of Math. Ser. B., 36 (2015), 345–354. DOI: 10.1007/s11401-015-0914-8
• Sekizawa, M., Natural transformations of affine connections on manifolds to metrics on cotangent bundles, Proc. 14th Winter School. Srn´ı, Czech, 1986, Suppl. Rend. Circ. Mat. Palermo, Ser., 14(2) (1987), 129—142.
• Yano, K., Ishihara, S., Tangent and Cotangent Bundles, Mercel Dekker, Inc., New York, 1973.