References
- [1] D. Chinea, Harmonicity on maps between almost contact metric manifolds, Acta Math. Hungar. 126 (2010), no. 4, 352-362.
- [2] J. Eells, J. H. Sampson, Harmonic mappings of Riemannian manifolds, Amer. J. Math. 86 (1964), 109-160
- [3] B. Fuglede, Harmonic morphisms between Riemannian Manifolds, An- nales de l’ institute Fourier, tome 28, n02 (1978), p.107-144.
- [4] T. Ishihara, A mapping of Riemannian manifolds which preserves harmonic functions J. Math. Kyoto Univ. 19 (1979), 215229.
- [5] J. Eells and L. Lemaire, Report on harmonic maps, Bull, London Math. Soc. 20 (1988), 385-524.
- [6] C. Gherghe, Harmonicity on cosymplectic manifolds, Rocky Mountain J.Math. 40, No.6,(2010), 247-254.
- [7] C. Gherghe, S. Ianus, A. M. Pastore, Harmonic maps, harmonic morphism and stability, Bull. Math. Soc. Sci. Math. Roum. (2000), 1-11.
- [8] P. Gilkey, The spectral geometry of real and complex manifolds, Proc. Sympos. Pure Math.,vol. 27 (1975), pp. 265-280.
- [9] K. Kenmotsu, A class of almost contact Riemannian manifolds, Tohoku Math. J. 24 (1972), 93-103.
- [10] Tae Ho Kang, Hyun Suk Kim On the Spectral Geometry for the Jacobi Operators of Harmonic maps into a Sasakian or Cosymplectic Space form, Comm. Korean Math. Soc. 12 (1997), No. 2, pp. 373-382.
- [11] A. Lichnerowicz, Applications harmoniques et varits khleriennes, Sympos. Math. 3 (1970) 341402.
- [12] J. Rawnsley, f -structures, f -twistor spaces and harmonic maps, Lecture Notes in Math., vol. 1164, Springer-Verlag, 1984, pp. 85159.
- [13] S. Tanno, The automorphism groups of almost contact Riemannian manifolds, Thoku Math. J. (2) 21 (1969), 2138.
- [14] H. Urakawa, Spectral Geometry of the second variation operator of harmonic maps, Illinois J.Math., vol.3, no. 2, 1989.
- [15] K. Yano and M. Kon, Structures on manifolds, vol. 3, Series in pure Math., World Scientific, Singapore, 1984.