W
[War62] Stephen Warshall. A Theorem on Boolean Matrices. Journal of the ACM 9(1):11-12. ACM Press, January 1962. 
@article{jacm9(1)-War,
  author =              {Warshall, Stephen},
  title =               {A~Theorem on Boolean Matrices},
  publisher =           {ACM Press},
  journal =             {Journal of the~ACM},
  volume =              {9},
  number =              {1},
  pages =               {11-12},
  year =                {1962},
  month =               jan,
  doi =                 {10.1145/321105.321107},
}
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