@article{KuSiUl13,
  author = {{K}\"uhn, {T}homas and {S}ickel, {W}infried and {U}llrich, {T}ino},
  pages = {95--116},
  volume = {30},
  year = {2014},
  title = {Approximation numbers of {S}obolev embeddings--sharp constants and tractability},
  journal = {J. Complexity},
  annote = {journal,group},
  pdf = {https://www.tu-chemnitz.de/mathematik/ang_analysis/Publications/KuSiUl13.pdf}
}