M
[Mun71] J. Ian Munro. Efficient Determination of the Transitive Closure of a Directed Graph. Information Processing Letters 1(2):56-58. Elsevier, June 1971. 
@article{ipl1(2)-Mun,
  author =              {Munro, J. Ian},
  title =               {Efficient Determination of the Transitive Closure of
                         a Directed Graph},
  publisher =           {Elsevier},
  journal =             {Information Processing Letters},
  volume =              {1},
  number =              {2},
  pages =               {56-58},
  year =                {1971},
  month =               jun,
}
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