D
[Dij59] Edsger W. Dijkstra. A note on two problems in connexion with graphs. Numerische Mathematik 1:269-271. Springer-Verlag, 1959. 
@article{nm1()-Dij,
  author =              {Dijkstra, Edsger W.},
  title =               {A~note on two problems in connexion with graphs},
  publisher =           {Springer-Verlag},
  journal =             {Numerische Mathematik},
  volume =              {1},
  pages =               {269-271},
  year =                {1959},
  doi =                 {10.1007/BF01386390},
}
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