@article{TRSPY_2003_243_a4,
     author = {N. N. Andreev and V. A. Yudin},
     title = {Positive {Values} of {Harmonic} {Polynomials}},
     journal = {Informatics and Automation},
     pages = {46--52},
     publisher = {mathdoc},
     volume = {243},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2003_243_a4/}
}