In this paper the Nijenhuis tensor characteristic distributions on a non-integrable four-dimensional almost complex manifold is investigated for integrability, singularities and equivalence.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-bc62-0-13, author = {Boris S. Kruglikov}, title = {Characteristic distributions on 4-dimensional almost complex manifolds}, journal = {Banach Center Publications}, volume = {60}, year = {2003}, pages = {173-182}, zbl = {1073.53043}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc62-0-13} }
Boris S. Kruglikov. Characteristic distributions on 4-dimensional almost complex manifolds. Banach Center Publications, Tome 60 (2003) pp. 173-182. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc62-0-13/