@article{VSGU_2011_2_a2,
     author = {Yu. Yu. Krutikov and S. Yu. Popov},
     title = {The cohomological birational invariants for 4-dimensional tori},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {26--37},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2011_2_a2/}
}