@article{SM_1997_188_1_a3,
     author = {B. S. Kruglikov},
     title = {The image in $H^2(Q^3;\mathbb R)$ of the~set of presymplectic forms with a~prescribed kernel},
     journal = {Sbornik. Mathematics},
     pages = {75--85},
     publisher = {mathdoc},
     volume = {188},
     number = {1},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1997_188_1_a3/}
}