A Note on Two Problems in Connexion with Graphs. Dijkstra, E. Numer Math, 1:269–271, 1959.
bibtex   
@Article{dijkstra59note,
  author  = {E.W. Dijkstra},
  title   = {A Note on Two Problems in Connexion with Graphs},
  journal = {Numer Math},
  year    = {1959},
  volume  = {1},
  pages   = {269--271},
  file    = {Dijkstra_TwoProblemsGraphs_NumMath_1959.zip:1959/Dijkstra_TwoProblemsGraphs_NumMath_1959.zip:PDF},
}

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