@article{MZM_2007_81_4_a14,
     author = {E. Yu. Amerik},
     title = {On {Morphisms} onto {Quadrics}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {621--624},
     publisher = {mathdoc},
     volume = {81},
     number = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2007_81_4_a14/}
}