@misc{indiciae4040531ccfc6,
  title = {On Complexes with Operators.},
  author = {B Eckmann},
  year = {1953},
  doi = {10.1073/pnas.39.1.35},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589232/},
  note = {Source identifier: 16589232}
}