S
[SM73] Larry J. Stockmeyer and Albert R. Meyer. Word Problems Requiring Exponential Time: Preliminary Report. In STOC'73, pages 1-9. ACM Press, April 1973. 
@inproceedings{stoc1973-SM,
  author =              {Stockmeyer, Larry J. and Meyer, Albert R.},
  title =               {Word Problems Requiring Exponential Time:
                         Preliminary Report},
  booktitle =           {{P}roceedings of the 5th {A}nnual {ACM} {S}ymposium
                         on the {T}heory of {C}omputing ({STOC}'73)},
  acronym =             {{STOC}'73},
  publisher =           {ACM Press},
  pages =               {1-9},
  year =                {1973},
  month =               apr,
}
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