@article{ZNSL_1979_92_a3,
     author = {A. L. Vol'berg},
     title = {The simultaneous approximation by polynomials on the circle and in the interior of the disc},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {60--84},
     publisher = {mathdoc},
     volume = {92},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_92_a3/}
}