1. Brylinski J-L. A differential complex for Poisson manifolds. J Differential Geom, 1988, 28: 93–114
2. Cavalcanti G R. New aspects of the dd c -lemma. Ph D Thesis, Oxford Univ, 2005, arXiv: math/0501406v1
3. Ehresmann C, Libermann P. Sur le problème déquivalence des formes différentielles extérieures quadratiques. C R Acad Sci Paris, 1949, 229: 697–698
4. Fernández M, Muñoz V, Ugarte L. The dδ-lemma for weakly Lefschetz symplectic manifolds. In: Differential Geometry and Its Applications. Prague: Matfyzpress, 2005, 229–246
5. Fernández M, Muñoz V, Ugarte L.Weakly Lefschetz symplectic manifolds. Trans Amer Math Soc, 2007, 359: 1851–1873