@article{MZM_2008_84_2_a0,
     author = {A. V. Arutyunov},
     title = {Nonnegativity of {Quadratic} {Forms} on {Intersections} of {Quadrics} and {Quadratic} {Maps}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {163--174},
     publisher = {mathdoc},
     volume = {84},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2008_84_2_a0/}
}