P
[PV03] Nir Piterman and Moshe Y. Vardi. From Bidirectionality to Alternation. Theoretical Computer Science 295(1-3):295-321. Elsevier, February 2003. 
@article{tcs295(1-3)-PV,
  author =              {Piterman, Nir and Vardi, Moshe Y.},
  title =               {From Bidirectionality to Alternation},
  publisher =           {Elsevier},
  journal =             {Theoretical Computer Science},
  volume =              {295},
  number =              {1-3},
  pages =               {295-321},
  year =                {2003},
  month =               feb,
}
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