@article{Gol_dshtein_2020,<br/><span class="tab"></span> title={Sobolev extension operators and Neumann eigenvalues},<br/><span class="tab"></span> volume={10},<br/><span class="tab"></span> ISSN={1664-0403},<br/><span class="tab"></span> url={http://dx.doi.org/10.4171/jst/295},<br/><span class="tab"></span> DOI={10.4171/jst/295},<br/><span class="tab"></span> number={1},<br/><span class="tab"></span> journal={Journal of Spectral Theory},<br/><span class="tab"></span> publisher={European Mathematical Society - EMS - Publishing House GmbH},<br/><span class="tab"></span> author={Gol’dshtein,<br/><span class="tab"></span> Vladimir and Pchelintsev,<br/><span class="tab"></span> Valerii and Ukhlov,<br/><span class="tab"></span> Alexander},<br/><span class="tab"></span> year={2020},<br/><span class="tab"></span> month=feb,<br/><span class="tab"></span> pages={337–353} }