@article{MZM_1986_39_5_a11,
     author = {A. N. Skorobogatov},
     title = {Birational invariants of rational surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {736--746},
     publisher = {mathdoc},
     volume = {39},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_5_a11/}
}