@article{RitterSehgal2005,
  author    = {J{\"u}rgen Ritter and Sudarshan K. Sehgal},
  title     = {Trivial units in RG},
  journal   = {Mathematical Proceedings of the Royal Irish Academy},
  volume    = {105A},
  number    = {1},
  pages     = {25 -- 39},
  url       = {https://www.jstor.org/stable/40656896},
  year      = {2005},
}