@misc{indiciaed90021fede6c,
  title = {[Arnold Sommerfeld].},
  author = {K BECHERT},
  year = {1951},
  doi = {10.1007/bf02168705},
  url = {https://pubmed.ncbi.nlm.nih.gov/14937029/},
  note = {Source identifier: 14937029}
}