References
- Y.S. Balkan and N. Aktan, Some results on pseudo pseudo Ricci symmetric almost α-cosymplectic f -manifolds, Konuralp Journal of Mathematics 2 (2013), 57–66.
- C.L. Bejan and M. Crasmareanu, Second order parallel tensors and Ricci solitons in 3-dimensional normal paracontact geometry, Ann Glob. Anal. Geom. 46 (2014), 117–127.
- G. Calvaruso and V.M. Molina, Recent advances in paaracontact metric geometry, Int. J. Geom. Meth. Mod. Phys. 9 (2014), doi: 10.1142.
- L.P. Eisenhart, Symmetric tensors of the second order whose first covariant derivatives are zero, Transactions of the American Mathematical Society 25(2) (1923), 297–306.
- I.K. Erken, P. Dacko and C. Murathan, Almost α-paracosymplectic manifolds, J. Geom. Phys. (2014), http://doi.org/10.1016.
- S. Kaneyuki and F.L. Williams, Almost paracontact and parahodge structures on manifolds, Nagoya Math. J. 99 (1985), 173–187.
- H. Levy, Symmetric tensors of the second order whose covariant derivatives vanish, Annals of Mathematics 27(2) (1925), 91–98.
- A.K. Mondal, U.C. De and C. Özgür, Second order parallel tensor on (k, µ)-contact metric manifolds, An. Şt. Univ. Ovidius Constaņta, Ser. Mat. 18(1) (2011), 229–238.
- B.C. Montano, I.K. Erken and C. Murathan, Nullity conditions in paracontact geometry, Differential Geom. Appl. 30 (2012), 665–693.
- R. Sharma, Second order parallel tensor in real and complex space forms, International Journal of Mathematics and Mathematical Sciences 12 (1989), 787–790.
- R. Sharma, Second order parallel tensor on contact manifolds, Algebras, Groups and Geometries 7 (1990), 787–790.
- R. Sharma, Second order parallel tensor on contact manifolds II, C.R. Math. Rep. Acad. Sci. Canada 13(6) (1991), 259–264.
- Y. Wang and X. Liu, Second order parallel tensor on an almost kenmotsu manifolds satisfying the nullity distributions, Filomat 28(4) (2014), 839–847.
- S. Zamkovoy and V. Tzanov, Non-existence of flat paracontact metric structure in dimension greater than or equal to five, Ann. Sofia. Univ., Math and Inf. 100 (2010), 27–34.