@article{ZVMMF_1984_24_4_a2,
     author = {V. L. Kreps},
     title = {Quadratic forms nonnegative on the orthant},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {497--503},
     publisher = {mathdoc},
     volume = {24},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1984_24_4_a2/}
}