V
[VTL79] Jacobo Valdes, Robert Endre Tarjan, and Eugene L. Lawler. The recognition of series-parallel digraphs. In STOC'79, pages 1-12. ACM Press, April 1979. 
@inproceedings{stoc1979-VTL,
  author =              {Valdes, Jacobo and Tarjan, Robert Endre and Lawler,
                         Eugene L.},
  title =               {The recognition of series-parallel digraphs},
  booktitle =           {{P}roceedings of the 11th {A}nnual {ACM} {S}ymposium
                         on the {T}heory of {C}omputing ({STOC}'79)},
  acronym =             {{STOC}'79},
  publisher =           {ACM Press},
  pages =               {1-12},
  year =                {1979},
  month =               apr,
  doi =                 {10.1145/800135.804393},
}
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