V
[Var82] Moshe Y. Vardi. The Complexity of Relational Query Languages. In STOC'82, pages 137-146. ACM Press, mai 1982. 
@inproceedings{stoc1982-Var,
  author =              {Vardi, Moshe Y.},
  title =               {The Complexity of Relational Query Languages},
  booktitle =           {{P}roceedings of the 14th {A}nnual {ACM} {S}ymposium
                         on the {T}heory of {C}omputing ({STOC}'82)},
  acronym =             {{STOC}'82},
  publisher =           {ACM Press},
  pages =               {137-146},
  year =                {1982},
  month =               may,
}
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