@misc{indiciaef84fdb3cf60e,
  title = {Walter Keller (1894-1967).},
  author = {H R Wiedemann},
  year = {1991},
  doi = {10.1007/bf02093713},
  url = {https://pubmed.ncbi.nlm.nih.gov/2040344/},
  note = {Source identifier: 2040344}
}