@article{Shvartsman_2020,
title={Sobolev functions on closed subsets of the real line},
volume={250},
ISSN={0021-9045},
url={http://dx.doi.org/10.1016/j.jat.2019.105327},
DOI={10.1016/j.jat.2019.105327},
journal={Journal of Approximation Theory},
publisher={Elsevier BV},
author={Shvartsman,
Pavel},
year={2020},
month=feb,
pages={105327} }