@article{etna_vol57_pp57-66,
  author  = {Daniel Gerth},
  title   = {A note on numerical singular values of compositions with non-compact operators},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {57},
  year    = {2022},
  pages   = {57--66},
  doi     = {10.1553/etna_vol57s57},
}