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@article{IVM_2007_8_a7, author = {V. \`E. Gheit and N. Zh. Gheit}, title = {Nonnegativity criteria for fourth degree polynomials on the axis}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {70--73}, publisher = {mathdoc}, number = {8}, year = {2007}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_2007_8_a7/} }
V. È. Gheit; N. Zh. Gheit. Nonnegativity criteria for fourth degree polynomials on the axis. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (2007), pp. 70-73. http://geodesic.mathdoc.fr/item/IVM_2007_8_a7/