@article{10.1007/BF01386390,
  author = {Dijkstra, Edsger W.},
  title = {A Note on Two Problems in Connexion with Graphs},
  year = {1959},
  issue_date = {December 1959},
  publisher = {Springer-Verlag},
  address = {Berlin, Heidelberg},
  volume = {1},
  number = {1},
  issn = {0029-599X},
  url = {https://doi.org/10.1007/BF01386390},
  doi = {10.1007/BF01386390},
  journal = {Numer. Math.},
  month = dec,
  pages = {269–271},
  numpages = {3}
}