@misc{indiciae6e6b7d18f699,
  title = {The Algebraic Structure of Complexes.},
  author = {A W Tucker},
  year = {1939},
  doi = {10.1073/pnas.25.12.643},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588315/},
  note = {Source identifier: 16588315}
}