@article{TRSPY_1987_180_a39,
     author = {S. B. Vakarchuk},
     title = {On approximation of functions of two variables by generalized polynomials},
     journal = {Informatics and Automation},
     pages = {77--78},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a39/}
}