@article{SM_1987_57_2_a14,
     author = {R. S. Varga and A. J. Carpenter},
     title = {On a~conjecture of {S.~Bernstein} in approximation theory},
     journal = {Sbornik. Mathematics},
     pages = {547--560},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_57_2_a14/}
}