@article{ZNSL_1996_234_a8,
     author = {B. S. Kruglikov},
     title = {On the image in $H^2(Q^3;R)$ of the set of closed 2-forms with preassigned kernel},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {125--136},
     publisher = {mathdoc},
     volume = {234},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_234_a8/}
}