%0 Journal Article %A Yattselev, Maxim L. %T On smooth perturbations of Chebyshëv polynomials and $ \bar {\partial } $-Riemann–Hilbert method %J Canadian mathematical bulletin %D 2023 %P 142-155 %V 66 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008439522000145/ %R 10.4153/S0008439522000145 %F 10_4153_S0008439522000145