@article{TM_2003_241_a10,
     author = {V. L. Popov},
     title = {The {Cone} of {Hilbert} {Nullforms}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {192--209},
     year = {2003},
     volume = {241},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2003_241_a10/}
}