@article{1077294537,
author = {Geiges, Hansj\"org},
title = {Symplectic structures on $T^2$ -bundles over $T^2$},
journal = {Duke Math. J.},
volume = {68},
number = {1},
year = {1992},
pages = { 539-555},
language = {en},
url = {http://dml.mathdoc.fr/item/1077294537}
}
Geiges, Hansjörg. Symplectic structures on $T^2$ -bundles over $T^2$. Duke Math. J., Tome 68 (1992) no. 1, pp. 539-555. http://gdmltest.u-ga.fr/item/1077294537/