[1] E. Abbena: Una osservazione sulle varieta almost Kähler. Atti dell'Acаdemiа delle Scienze di Torino, 115 (1981), 357-362.

[2] N. Brotherton: Some parallelizable four manifolds not admitting a complex structure. Bull. London Mаth. Soc., 10 (1978), 303-304. MR 0519914 | Zbl 0409.53031

[3] L. A. Cordero M. Fernández A. Grаy: Variétés sympléctiques sans structures kähleriennes. C. R. Acad. Sci. Pаris, 301 (1985), 217-218. MR 0801966

[4] L. A. Cordero M. Fernández A. Grаy: Symplectic manifolds without Kähler structure. Topology, 25, 3 (1986), 375-380. MR 0842431

[5] L. A. Cordero M. Fernández M. de León: Examples of compact non-Kähler almost Kähler manifolds. Proc. Amer. Mаth. Soc. 95 (1985), 280-286. MR 0801339

[6] P. Deligne P. Griffiths J. Morgаn D. Sullivаn: Real homotopy theory of Kähler manifolds. lnvent. Mаth., 29 (1975), 245-274. MR 0382702

[7] P. Dombrowski: On the geometry of tangent bundle. J. Reine Angew. Mаth., 210 (1962), 73-88. MR 0141050

[8] M. Fernández M. Gotаy A. Grаy: Four-dimensional parallelizable symplectic and complex manifolds. Proc Amer. Mаth. Soc. 103 (1988), 1209-1212. MR 0955011

[9] M. Fernández M. de León: Some properties of the holomorphic sectional curvature of the tangent bundle. Rend. Sem. Fac. Sci. Univ. Cagliari, 56, 1 (1986), 11-19. MR 0887093

[10] S. Kobayashi: Principal fibre bundles with the 1-dimensional toroidal group. Tôhoku Math. J. (2) 8 (1956), 29-45. MR 0080919 | Zbl 0075.32103

[11] S. Kobayashi: Topology of positively pinched Kähler manifolds. Tôhoku Math. J. (2) 15 (1963), 121-139. MR 0154235 | Zbl 0114.37601

[12] K. Kodaira: On the structure of compact complex analytic surfaces, I. Amer. J. Math., 86 (1964), 751-798. MR 0187255 | Zbl 0137.17501

[13] W. R. Thurston: Some simple examples of symplectic manifolds. Proc Amer. Math. Soc., 55 (1976), 467-468. MR 0402764 | Zbl 0324.53031

[14] Ph. Tondeur: Structure presque kählerienne naturelle sue le fibré des vecteurs covariants d'une variété riemannienne. C. R. Acad. Sci. Paris, 254 (1962), 407-408. MR 0131250

[15] A. Van de Ven: On the Chern numbers of certain complex and almost complex manifolds. Proc. Nat. Acad. Sci. U.S.A., 55 (1966), 1624-1627. MR 0198496

[16] B. Watson: New examples of strictly almost Kähler manifolds. Proc. Amer. Math. Soc, 88 (1983), 541-544. MR 0699430 | Zbl 0517.53039

[17] A. Weinstein: Lectures on symplectic manifolds. CBMS Reg. Conf. Ser. Math. 29, Amer. Math. Soc. (1977). MR 0464312 | Zbl 0406.53031

[18] S. T. Yau: Parallelizable manifolds without complex structure. Topology, 15 (1976), 51-53. MR 0397030 | Zbl 0331.32013