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[BMM+00] Jean-Camille Birget, Stuart W. Margolis, John C. Meakin, and Pascal Weil. PSPACE-Completeness of Certain Algorithmic Problems on the Subgroups of Free Groups. Theoretical Computer Science 242(1-2):247-281. Elsevier, July 2000. 
@article{tcs242(1-2)-BMMW,
  author =              {Birget, Jean-Camille and Margolis, Stuart W. and
                         Meakin, John C. and Weil, Pascal},
  title =               {{PSPACE}-Completeness of Certain Algorithmic
                         Problems on the Subgroups of Free Groups},
  publisher =           {Elsevier},
  journal =             {Theoretical Computer Science},
  volume =              {242},
  number =              {1-2},
  pages =               {247-281},
  year =                {2000},
  month =               jul,
}
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