@article{TRSPY_1987_180_a6,
     author = {V. V. Andrievskii},
     title = {On the approximation of functions by harmonic polynomials},
     journal = {Informatics and Automation},
     pages = {28--29},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a6/}
}