@misc{indiciae38a1ed584011,
  title = {TWO THEOREMS IN GRAPH THEORY.},
  author = {C Berge},
  year = {1957},
  doi = {10.1073/pnas.43.9.842},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590096/},
  note = {Source identifier: 16590096}
}