@article{KMU15,
  author = {{K}\"uhn, Thomas and {M}ayer, Sebastian and {U}llrich, Tino},
  title = {{C}ounting via entropy: new preasymptotics for the approximation numbers of {S}obolev embeddings },
  year = {2016},
  volume = {54(6)},
  pages = {3625 -- 3647},
  journal = {SIAM Journ. on Numerical Analysis},
  annote = {journal,group},
  eprint = {1505.00631},
  pdf = {https://www.tu-chemnitz.de/mathematik/ang_analysis/Publications/KMU15.pdf}
}