@article{DAN_1971_199_4_a5,
     author = {I. I. Ibragimov and A. D. Gadzhiev and V. M. Shakhverdiev},
     title = {On conditions for monotonicity of the sequence of derivatives of {Gel{\textquoteright}fond--Bernstein} polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {762--765},
     publisher = {mathdoc},
     volume = {199},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_199_4_a5/}
}